APA

Mehrtens J. M., . (1987). Living snakes of the world in color. New York: Sterling.

Chicago

Mehrtens John M, . 1987. Living snakes of the world in color. New York: Sterling.

Harvard

Mehrtens J. M., . (1987). Living snakes of the world in color. New York: Sterling.

MLA

Mehrtens John M, . Living snakes of the world in color. New York: Sterling. 1987.