Citazione APA

Charters, W. W., Betz, A., & Cowan, E. M. (1930). Essential language habits. Silver, Burdett and Company.

Stile di citazione Chicago

Charters, W. W., Annette Betz, e Esther Marshall Cowan. Essential Language Habits. New York, Chicago [etc.]: Silver, Burdett and Company, 1930.

Citazione MLA

Charters, W. W., et al. Essential Language Habits. Silver, Burdett and Company, 1930.