APA

Roberts M. B. V., . (1971). Biology: A functional approach. : ELBS, London.

Chicago

Roberts M B V, . 1971. Biology: A functional approach. : ELBS, London.

Harvard

Roberts M. B. V., . (1971). Biology: A functional approach. : ELBS, London.

MLA

Roberts M B V, . Biology: A functional approach. : ELBS, London. 1971.