edited by John Fawcett
World Vision, 2003
Buku Teks
World Vision, 2003
Buku Teks
edited by Alexander L. Eastman, David H. Rosenbaum, Erwin R. Thal
Mosby Elsevier, 2009
Buku Referensi
Sage Publications, 2009
eBooks
Evi Sukmaningrum
Fakultas Psikologi Universitas Indonesia, 2004
UI - Tesis Membership