APA (7th ed.) Citation

Holt, K., Geschka, H., & Peterlongo, G. (1984). Need assessment: A key to user-oriented product innovation. Wiley.

Chicago Style (17th ed.) Citation

Holt, Knut, Horst Geschka, and Giovanni Peterlongo. Need Assessment: A Key to User-oriented Product Innovation. Chichester u.a: Wiley, 1984.

MLA (9th ed.) Citation

Holt, Knut, et al. Need Assessment: A Key to User-oriented Product Innovation. Wiley, 1984.