Harvey, Harriet
A Merloyd Lawrence Book, 1983
Buku Teks SO
by Jack Canfield ... [and others]
Health Communication, 1997
Buku Teks SO
Antonoff, Steven R.
Octameron Associates, 2003
Buku Teks
Marius, Richard
McGraw-Hill, 1988
Buku Teks SO
Muhammad Farhan Arviandy
Fakultas Psikologi Universitas Indonesia, 2022
UI - Skripsi Membership