APA (7th ed.) Citation

LEOW & Foo. (1994). A guide to hydroponics. Singapore Science Centre.

Chicago Style (17th ed.) Citation

LEOW and Foo. A Guide to Hydroponics. Singapore: Singapore Science Centre, 1994.

MLA (9th ed.) Citation

LEOW and Foo. A Guide to Hydroponics. Singapore Science Centre, 1994.

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