Citazione APA

Greenoak, F. (1981). All the birds of the air (2nd ed.). Penguin Book.

Stile di citazione Chicago

Greenoak, Francesca. All the Birds of the Air. 2nd ed. England: Penguin Book, 1981.

Citazione MLA

Greenoak, Francesca. All the Birds of the Air. 2nd ed. Penguin Book, 1981.