APA
Paul Smart, . (1976). The Illustrated encyclopedia of the butterfly world. Hamlyn Publ, London: .
Chicago
Paul Smart, . 1976. The Illustrated encyclopedia of the butterfly world. Hamlyn Publ, London: .
Harvard
Paul Smart, . (1976). The Illustrated encyclopedia of the butterfly world. Hamlyn Publ, London: .
MLA
Paul Smart, . The Illustrated encyclopedia of the butterfly world. Hamlyn Publ, London: . 1976.