APA
Nicholson E. M. C., . (1968). Handbook to the conservation section of the international biological programme. Oxford: Blackwell Scientific Publications.
Chicago
Nicholson E M Comp, . 1968. Handbook to the conservation section of the international biological programme. Oxford: Blackwell Scientific Publications.
Harvard
Nicholson E. M. C., . (1968). Handbook to the conservation section of the international biological programme. Oxford: Blackwell Scientific Publications.
MLA
Nicholson E M Comp, . Handbook to the conservation section of the international biological programme. Oxford: Blackwell Scientific Publications. 1968.