Παραπομπή APA

Gray, P. (1970). encyclopaedia of the biological sciences. Van Nostrand Reinhold Company.

Παραπομπή Chicago Style

Gray, Peter. Encyclopaedia of the Biological Sciences. New York: Van Nostrand Reinhold Company, 1970.

Παραπομπή MLA

Gray, Peter. Encyclopaedia of the Biological Sciences. Van Nostrand Reinhold Company, 1970.