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Wadsworth, 2001
Buku Teks
Ashford, Jose B., author
Cengage Learning, 2018
Buku Teks
Zastrow, Charles, author
Nelson-Hall, 1989
Buku Teks
Maya Eka Sari Prawiro, author
2016
UI - Tesis Membership
Zastrow, Charles, author
Cengage Learning, 2016
Buku Teks SO