Cita APA (7th ed.)
Semmelmeyer, M. (1990). Practical english. Career Institute.
Cita Chicago (17th ed.)
Semmelmeyer, Madeline. Practical English. New Jersey: Career Institute, 1990.
Cita MLA (9th ed.)
Semmelmeyer, Madeline. Practical English. Career Institute, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.