Ziglar, Z. (2003). Selling 101.
Chicago Style (17th ed.) CitationZiglar, Zig. Selling 101. Mumbai, 2003.
MLA (9th ed.) CitationZiglar, Zig. Selling 101. 2003.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.
Ziglar, Z. (2003). Selling 101.
Chicago Style (17th ed.) CitationZiglar, Zig. Selling 101. Mumbai, 2003.
MLA (9th ed.) CitationZiglar, Zig. Selling 101. 2003.