Won-seop, KIM
Alex Media Komputindo, 2012
Buku Teks
Sinaga, Agnes Gautama
Fakultas Psikologi Universitas Indonesia, 2013
UI - Skripsi (Membership)
Ayu Prilia Puspitasari
2017
UI - Skripsi (Membership)
Apsanti Djokosuyatno
Universitas Indonesia, 1997
UI - Laporan Penelitian
McKee, William S.
Warren,Gorham and Lamont, 1978
Buku Teks