Παραπομπή APA

Riebel, J. (1963). How to write successful business letters. Taraporcvala & sons co.

Παραπομπή Chicago Style

Riebel, J.P. How to Write Successful Business Letters. Bombay: Taraporcvala & sons co, 1963.

Παραπομπή MLA

Riebel, J.P. How to Write Successful Business Letters. Taraporcvala & sons co, 1963.