APA (7e ed.) Bronvermelding

Cassidy, D. (1993). It`s when you sell that counts. Vision Books.

Chicago (17e ed.) Bronvermelding

Cassidy, Donald. It`s When You Sell That Counts. New Delhi: Vision Books, 1993.

MLA (9e ed.) Bronvermelding

Cassidy, Donald. It`s When You Sell That Counts. Vision Books, 1993.