APA (7th ed.) Citation

Sumiko, H., Keiko, & Yumi. (1997). Hello!: Japanese for Asian people. Bonjinsha Co.

Chicago Style (17th ed.) Citation

Sumiko, Hachiwaka, Keiko, and Yumi. Hello!: Japanese for Asian People. Japan: Bonjinsha Co, 1997.

MLA (8th ed.) Citation

Sumiko, Hachiwaka, et al. Hello!: Japanese for Asian People. Bonjinsha Co, 1997.