APA (7e ed.) Bronvermelding

Roberts-Phelps Graham. (2005). Guide to Telephone Tactics (1.). VIVA Books Private Limited.

Chicago (17e ed.) Bronvermelding

Roberts-Phelps Graham. Guide to Telephone Tactics. 1. New Delhi: VIVA Books Private Limited, 2005.

MLA (9e ed.) Bronvermelding

Roberts-Phelps Graham. Guide to Telephone Tactics. 1. VIVA Books Private Limited, 2005.