Gaya APA

Swanson, C, P., Dixson, R, J. (NULL). Modern american english 3 workbook . New: New York: Regents Publishing; 1971.

Gaya MLA

Swanson, Carl, P.., Dixson, Robert, J.. "Modern american english 3 workbook". New: New York: Regents Publishing; 1971, NULL. Text.