Παραπομπή APA

Garber,Peter.R. (2007). 25 Sales strategies and activities. H.R.D.

Παραπομπή Chicago Style

Garber,Peter.R. 25 Sales Strategies and Activities. Ahberst: H.R.D, 2007.

Παραπομπή MLA

Garber,Peter.R. 25 Sales Strategies and Activities. H.R.D, 2007.