Volcanoes /
A. and L. Rittmann.

APA Citation

Rittmann, A., Rittmann, L. (1976). Volcanoes. New York: Putnam.

MLA Citation

Rittmann, Alfred, 1893-1980, and L. Rittmann. Volcanoes. New York: Putnam, 1976.

Warning: These citations may not always be complete (especially for serials).