Cita APA (7a ed.)

Pietro, R. J. (1971). Language structures in contrast. Newbury House Publishers.

Cita Chicago Style (17a ed.)

Pietro, Robert J. Language Structures in Contrast. Rowley, Mass: Newbury House Publishers, 1971.

Cita MLA (9a ed.)

Pietro, Robert J. Language Structures in Contrast. Newbury House Publishers, 1971.