APA (7th ed.) Citation

Gan & Yong. (1993). Now and then. Federal Publications.

Chicago Style (17th ed.) Citation

Gan and Yong. Now and Then. Singapore: Federal Publications, 1993.

MLA (8th ed.) Citation

Gan and Yong. Now and Then. Federal Publications, 1993.

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