Παραπομπή APA

Berger, A. A. (1993). Improving writing skills: Memos,letters,reports and proposals (1st.). Sage Publication.

Παραπομπή Chicago Style

Berger, Arthur Asa. Improving Writing Skills: Memos,letters,reports and Proposals. 1st. California: Sage Publication, 1993.

Παραπομπή MLA

Berger, Arthur Asa. Improving Writing Skills: Memos,letters,reports and Proposals. 1st. Sage Publication, 1993.