APA

Heckelmann C. N., . (1952). Hell in his holsters. New York: A Signet Book.

Chicago

Heckelmann Charles N, . 1952. Hell in his holsters. New York: A Signet Book.

Harvard

Heckelmann C. N., . (1952). Hell in his holsters. New York: A Signet Book.

MLA

Heckelmann Charles N, . Hell in his holsters. New York: A Signet Book. 1952.