APA

Erdtman G., . (1943). An introduction to pollen analysis. New York: Ronald Press.

Chicago

Erdtman G, . 1943. An introduction to pollen analysis. New York: Ronald Press.

Harvard

Erdtman G., . (1943). An introduction to pollen analysis. New York: Ronald Press.

MLA

Erdtman G, . An introduction to pollen analysis. New York: Ronald Press. 1943.