Callery, Dymphna
N. Hern, 2001
Buku Teks SO
edited by Phillip B. Zarrilli
Routledge, 1995
Buku Teks SO
McGaw, Charles
Holt, Rinehart and Winston, 1965
Buku Teks SO
Koner, Pauline
Harwood Academic Publishers, 1998
Buku Teks SO
Gladhys Elliona Syahutari
2017
UI - Skripsi Membership