Citazione APA

McKnight, G. H., Haber, T. B., & Hatfield, W. W. (1939). A grammar of living English. American Book Co..

Stile di citazione Chicago

McKnight, George Harley, Tom Burns Haber, e W. Wilbur Hatfield. A Grammar of Living English. New York, Cincinnati: American Book Co., 1939.

Citazione MLA

McKnight, George Harley, et al. A Grammar of Living English. American Book Co., 1939.