Gaya APA

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

Gaya MLA

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