Cita APA (7a ed.)

Haffert, J. M. (1967). The world's greatest secret. AMI Pres.

Cita Chicago Style (17a ed.)

Haffert, John M. The World's Greatest Secret. Washington: AMI Pres, 1967.

Cita MLA (9a ed.)

Haffert, John M. The World's Greatest Secret. AMI Pres, 1967.