Citazione Stile APA (7a Edizione)

Robbins, L. (1952). An essay on the nature & significance of eco. sc (2nd rev.). Macmillan.

Citazione stile Chigago Style (17a edizione)

Robbins, Liohel. An Essay on the Nature & Significance of Eco. Sc. 2nd rev. London: Macmillan, 1952.

Citatione MLA (9a ed.)

Robbins, Liohel. An Essay on the Nature & Significance of Eco. Sc. 2nd rev. Macmillan, 1952.