Hollins, Carole
Wiley Blackwell, 2013
Buku Teks SO
Phinney, Donna J.
Thomson Delmar Learning, 2008
Multimedia
Bird, Doni L.
Saunders Elsevier, 2009
Buku Teks SO
Ayudewi Komala Indriastuti
2016
UI - Skripsi Membership
Phinney, Donna J.
Thomson, Delmar Learning, 2008
Buku Teks SO