APA (7th ed.) Citation

Lexus, Smyth, D., & Smyth, S. (1999). Thai: A Rough guide phrasebook. Rough Guides Ltd.

Chicago Style (17th ed.) Citation

Lexus, David Smyth, and Somsong Smyth. Thai: A Rough Guide Phrasebook. London: Rough Guides Ltd, 1999.

MLA (9th ed.) Citation

Lexus, et al. Thai: A Rough Guide Phrasebook. Rough Guides Ltd, 1999.