Cita APA (7a ed.)
Watkins, F. C. (1982). Practical English Workbook. (2a. ed.). Hougton Mifflin Company.
Cita Chicago Style (17a ed.)
Watkins, Floyd C. Practical English Workbook. 2a. ed. Estados Unidos: Hougton Mifflin Company, 1982.
Cita MLA (9a ed.)
Watkins, Floyd C. Practical English Workbook. 2a. ed. Hougton Mifflin Company, 1982.
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