Citazione Stile APA (7a Edizione)

SHELTOR, N., & BURTON, S. (1994). Assertiveness skills. Businnes One Irwin.

Citazione stile Chigago Style (17a edizione)

SHELTOR, Nelda, e Sharon BURTON. Assertiveness Skills. Burr Ridge: Businnes One Irwin, 1994.

Citatione MLA (9a ed.)

SHELTOR, Nelda, e Sharon BURTON. Assertiveness Skills. Businnes One Irwin, 1994.