Petersen, W. L. (1985). The Diatessaron and Ephrem Syrus as sources of Romanos the Melodist. E. Peeters.
Lua i Stíl Chicago (17ú heag.)Petersen, William Lawrence. The Diatessaron and Ephrem Syrus as Sources of Romanos the Melodist. Lovanii: E. Peeters, 1985.
Lua MLA (8ú heag.)Petersen, William Lawrence. The Diatessaron and Ephrem Syrus as Sources of Romanos the Melodist. E. Peeters, 1985.
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