Snead, G. Lynne
A Fireside Book, 1997
Buku Teks
Scott, Kim
Pan Books, 2019
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Rifani Aditiya Triana
Fakultas Teknik Universitas Indonesia, 2016
UI - Skripsi Membership
Levithan, David
PT. Gramedia Pustaka Utama, 2018
Buku Teks
Oloi, Peter Samuel
Fakultas Psikologi Universitas Indonesia, 2015
UI - Skripsi Membership