APA (7th ed.) Citation

Zaidan, M. Y., & unknown. (1990). Design of voiceband echo cancellers.

Chicago Style (17th ed.) Citation

Zaidan, Mahdi Yahya, and unknown. Design of Voiceband Echo Cancellers. 1990.

MLA (9th ed.) Citation

Zaidan, Mahdi Yahya, and unknown. Design of Voiceband Echo Cancellers. 1990.

Warning: These citations may not always be 100% accurate.