APA (7th ed.) Citation

Koo, J. H. (1994). Let's speak korean. Samji Books.

Chicago Style (17th ed.) Citation

Koo, John H. Let's Speak Korean. Seúl: Samji Books, 1994.

MLA (9th ed.) Citation

Koo, John H. Let's Speak Korean. Samji Books, 1994.