Gaya APA

Swanson, C, P., Nicholson, E. (1968). Handbook to the conservation section of the international biological ì programme . London: London: Edward ltd; 1968.

Gaya MLA

Swanson, Carl, P.., Nicholson, E.M.. "Handbook to the conservation section of the international biological ì programme". London: London: Edward ltd; 1968, 1968. Text.