Cita APA (7a ed.)

Hankes, E. J. (1992). A universal second language (Preliminary edition.). Hankes Foundation.

Cita Chicago Style (17a ed.)

Hankes, Elmer Joseph. A Universal Second Language. Preliminary edition. Minneapolis: Hankes Foundation, 1992.

Cita MLA (9a ed.)

Hankes, Elmer Joseph. A Universal Second Language. Preliminary edition. Hankes Foundation, 1992.