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Buku Teks
Cole, Luella, author
Holt Rinehart and Winston, 1959
Buku Teks
Santrock, John W., author
McGraw-Hill, 2016
Buku Teks
Fleming, C.M., author
Routledge and Kegan Paul, 1955
Buku Teks
Nadya Febrianti, author
Fakultas Psikologi Universitas Indonesia, 2015
UI - Skripsi (Membership)