Roberts-Phelps, G. (2004). The concise guide to telephone tactics. Thorogood.
Lua i Stíl Chicago (17ú heag.)Roberts-Phelps, Graham. The Concise Guide to Telephone Tactics. London: Thorogood, 2004.
Lua MLA (9ú heag.)Roberts-Phelps, Graham. The Concise Guide to Telephone Tactics. Thorogood, 2004.
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