Citazione APA

Gondin, W. R., & Mammen, E. W. (1967). The art of speaking: Made simple. W H Allen.

Stile di citazione Chicago

Gondin, William R., e Edward W. Mammen. The Art of Speaking: Made Simple. London: W H Allen, 1967.

Citazione MLA

Gondin, William R., e Edward W. Mammen. The Art of Speaking: Made Simple. W H Allen, 1967.