Citazione Stile APA (7a Edizione)

Heppner, F. H. (1990). Professor Farnsworth's explanations in biology. McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Heppner, Frank H. Professor Farnsworth's Explanations in Biology. New York: McGraw-Hill, 1990.

Citatione MLA (9a ed.)

Heppner, Frank H. Professor Farnsworth's Explanations in Biology. McGraw-Hill, 1990.