Cita APA (7th ed.)
Watkins, F. C., Dillingham, W. B., & Martin, E. T. (1974). Practical English handbook (4th ed.). Houghton Mifflin.
Cita Chicago (17th ed.)
Watkins, Floyd C., William B. Dillingham, i Edwin Thomas Martin. Practical English Handbook. 4th ed. Boston: Houghton Mifflin, 1974.
Cita MLA (9th ed.)
Watkins, Floyd C., et al. Practical English Handbook. 4th ed. Houghton Mifflin, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.