Cita APA (7th ed.)

Hankes, E. J. (1992). A universal second language. s.n.

Cita Chicago (17th ed.)

Hankes, Elmer Joseph. A Universal Second Language. Minneapolis: s.n, 1992.

Cita MLA (9th ed.)

Hankes, Elmer Joseph. A Universal Second Language. s.n, 1992.