Gaya APA
Ryu, P, K, L, &, C, S. (1989).
Let's talk in Korean, 2nd rev.ed. Cet.I 1979 .
New Jersey:
New Jersey Hollym.
Gaya MLA
Ryu, Pong, Kook, Lee, &, Chi, Sik.
"Let's talk in Korean, 2nd rev.ed. Cet.I 1979 ".
New Jersey:
New Jersey Hollym,
1989.
Buku.