Παραπομπή APA

Whitehead, G. (1969). Commerce: Made simple. W.H Allen and co.

Παραπομπή Chicago Style

Whitehead, G.M. Commerce: Made Simple. London: W.H Allen and co, 1969.

Παραπομπή MLA

Whitehead, G.M. Commerce: Made Simple. W.H Allen and co, 1969.