Altman, N. (1994). Sacred Trees. San Francisco: Sierra Club Books. 

Analog Photo Fun (Photographer). (2012) Quercus robur - the English oak or pedunculate oak. [Photo] Retrieved 18 Feb 2013 from http://www.flickr.com/photos/79818573@N04/7315218946/

Barkley, Y.C. (January 2007). Oaks. Alternative Tree Crops Information Series, 6, 1-6. Retrieved from http://www.uidaho.edu/~/media/Files/Extension/Forestry/Forest%20Products/Alternative%20Products/Oaks.ashx

Brand, M. (2001). Quercus robur: english oak, truffle oak, pedunculate oak. In UConn Plant Database. Retrieved from http://www.hort.uconn.edu/plants/q/querob/querob1.html

California State University. (1995). World of trees nature trail [Brochure]. Retrieved from http://www.csuchico.edu/jour/history_pages/Fall95Art/World%20of%20Trees%20Nature%20Trail-Brochure.pdf

Casteras, S.P., & Alfred, T. (1990). William Maw Egley's "the talking oak". Bulletin of the Detroit Institute of Arts, 65(4), pp. 26-39. http://www.jstor.org/stable/pdfplus/41504829.pdf?acceptTC=true

Colavecchio, A. (2006). English oak (Quercus robur). In University of Delaware, Department of Entomology and Wildlife Ecology. Retrieved from http://udel.edu/~prodrick/IronHill/FieldGuides/englishoak.htm

Coll, J. (Photographer). (2009) Arbre Tree. [Photo] Retrieved 18 Feb 2013 from http://www.flickr.com/photos/jeromecoll/3262851169/ 

Fox, T. (2004). English oak: Quercus robur. In Nazareth College North and South Campus Tree Walks. Retrieved from http://www-pub.naz.edu/~treewalk/north_tree_walk/quercus_robur/index.htm

Friel, I. (2009). English Merchant Ships and Shipbuilding. Retrieved from Gresham College website: http://www.gresham.ac.uk/lectures-and-events/elizabethan-merchant-ships-and-shipbuilding 

Gilman, E.F., & Watson, D.G. (2012). Quercus robur: English oak. In University of Florida, IFAS Extension. Retrieved from http://edis.ifas.ufl.edu/st558

Harris, D. (Photographer). (2009). The Major Oak. [Photo] Retrieved 18 Feb 2013 from http://www.flickr.com/photos/duncanh1/4122906260/

KiG. (Photographer). (2010).  Schulgarten Langenlois. [Photo] Retrieved 19 Mar 2013 from http://www.flickr.com/photos/klasseimgarten/4724988277/ 

Lamerie. (Photographer). (2006). Oak, European. [Photo] Retrieved 18 Feb 2013 from http://www.flickr.com/photos/lamerie/246690107/

Levy, D. (Photographer). (2010). Cabot’s Matthew. [Photo] Retrieved 19 March 2013 from http://www.flickr.com/photos/davelevy/4842208480/ 

Matta, A. (November 2004). English oak. In Bellarmine Univeristy: In Veritatis Amore. Retrieved from http://www.bellarmine.edu/faculty/drobinson/EnglishOak.asp

Niven, B.S., & Liddle, M.J. (1994). Classification of the environment and the community of the Quercus robur. Journal of Vegetation Science, 5(3), pp. 317-326.http://www.jstor.org/stable/3235855.

Palmer, J. (2003). The major oak, Sherwood Forest, England. International Oaks, 14, pp. 25-28. http://search.ebscohost.com/login.aspx?direct=true&db=eih&AN=49139889&site=ehost-live

Shakespeare, W. (2005). The Oxford Shakespeare. (2nd ed.) Wells, S., Taylor, G., Jowett, J., & Montgomery, W. (Eds.). London: Oxford University Press. 

Tolkien, J.R.R. (2002). The Annotated Hobbit. Anderson, D.A. (ed.) New York City: Houghton Mifflin Harcourt. 

Tolkien, J.R.R. (2009). The Legend of Sigurd and Gudrun. New York City: Houghton Mifflin Harcourt.