The enemy within;
the inside story of German sabotage in America /
by Captain Henry Landau, profusely illustrated with photographs and photostatic copies of original documents.
APA Citation
Landau, H. (1937). The enemy within: the inside story of German sabotage in America. [New York]: G. P. Putnam's sons.
MLA Citation
Landau, Henry, 1892-1968. The Enemy Within: the Inside Story of German Sabotage In America. [New York]: G. P. Putnam's sons, 1937.
Warning: These citations may not always be complete (especially for serials).