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).