Cita APA (7a ed.)

Heuduck, P. (1941). Post Office receipt, October 3, 1941. Saint Louis University Libraries Digitization Center.

Cita Chicago Style (17a ed.)

Heuduck, Paul. Post Office Receipt, October 3, 1941. Saint Louis University Libraries Digitization Center, 1941.

Cita MLA (8a ed.)

Heuduck, Paul. Post Office Receipt, October 3, 1941. Saint Louis University Libraries Digitization Center, 1941.