APA (7th ed.) Citation

Hoare, C., Jifeng, H., & Friesen, O. (1987). Design and Proof of a Mail Service.

Chicago Style (17th ed.) Citation

Hoare, C., H. Jifeng, and O. Friesen. Design and Proof of a Mail Service. 1987.

MLA (9th ed.) Citation

Hoare, C., et al. Design and Proof of a Mail Service. 1987.

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