Παραπομπή APA

Holt, K., Horst Geschka, & Giovanni Peterlongo. (1984). Need assessment. John Wiley.

Παραπομπή Chicago Style

Holt, Knut, Horst Geschka, και Giovanni Peterlongo. Need Assessment. Chichester: John Wiley, 1984.

Παραπομπή MLA

Holt, Knut, et al. Need Assessment. John Wiley, 1984.