APA

Smith R. L., . (1966). Ecology and field biology. New York: Harper & Row.

Chicago

Smith Robert Leo, . 1966. Ecology and field biology. New York: Harper & Row.

Harvard

Smith R. L., . (1966). Ecology and field biology. New York: Harper & Row.

MLA

Smith Robert Leo, . Ecology and field biology. New York: Harper & Row. 1966.