APA
Nievergelt B., . (1981). Ibexes in an African environment. Berlin: Springer-Verlag.
Chicago
Nievergelt Berhard, . 1981. Ibexes in an African environment. Berlin: Springer-Verlag.
Harvard
Nievergelt B., . (1981). Ibexes in an African environment. Berlin: Springer-Verlag.
MLA
Nievergelt Berhard, . Ibexes in an African environment. Berlin: Springer-Verlag. 1981.