APA (7th ed.) Citation

Yeung, K., Ng, K., & Yuen, F. (1989). An automatic raingauge system. Royal Observatory.

Chicago Style (17th ed.) Citation

Yeung, Kai-hing, Kwok-keung Ng, and Fu-tat Yuen. An Automatic Raingauge System. Hong Kong: Royal Observatory, 1989.

MLA (9th ed.) Citation

Yeung, Kai-hing, et al. An Automatic Raingauge System. Royal Observatory, 1989.