Gultom, Katherine Marsha Devina, author
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UI - Skripsi Membership
Dumilah Ayuningtyas, author
Universitas Indonesia, 2015
Buku Teks
Himmahwati Zahara Gani, author
2014
UI - Skripsi Membership
Joyce Young
Ina Publikatama , 2007
Buku Teks
Bryson, John M., author
Jossey- Bass, 2011
Buku Teks