Παραπομπή APA

Murrell, J. M., & Kettle, S. F. A. J. (1974). Valence theory (2nd ed.). ELBS and Wiley.

Παραπομπή Chicago Style

Murrell, J M., και S F A Jedder Kettle. Valence Theory. 2nd ed. London: ELBS and Wiley, 1974.

Παραπομπή MLA

Murrell, J M., και S F A Jedder Kettle. Valence Theory. 2nd ed. ELBS and Wiley, 1974.