APA aipamena

Shechan, A. (1972). Purnell's discovering nature. Purnell.

Chicago Style aipamena

Shechan, A. Purnell's Discovering Nature. London: Purnell, 1972.

MLA aipamena

Shechan, A. Purnell's Discovering Nature. Purnell, 1972.