Lua APA (7ú heag.)

Ziglar, Z. (2003). Selling 101.

Lua i Stíl Chicago (17ú heag.)

Ziglar, Zig. Selling 101. Mumbai, 2003.

Lua MLA (9ú heag.)

Ziglar, Zig. Selling 101. 2003.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.