APA
Bamm P., . (1956). The invisible flag. New York: The John Day Co.
Chicago
Bamm Peter, . 1956. The invisible flag. New York: The John Day Co.
Harvard
Bamm P., . (1956). The invisible flag. New York: The John Day Co.
MLA
Bamm Peter, . The invisible flag. New York: The John Day Co. 1956.
