Citazione Stile APA (7a Edizione)

Purdue University. Department of Engineering Extension. (1930). Extension series. Purdue University.

Citazione stile Chigago Style (17a edizione)

Purdue University. Department of Engineering Extension. Extension Series. Lafayette, Ind.: Purdue University, 1930.

Citatione MLA (8a ed.)

Purdue University. Department of Engineering Extension. Extension Series. Purdue University, 1930.