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Pusat Keilmuan, Lembaga Penelitian dan Pengabdian kepada Masyarakat, Universitas Terbuka, 2018
Artikel Jurnal
Fielding, Joy, author
Gramedia Pustaka Utama, 2005
Buku Teks
Porterfield, William H., author
Academic Press, 1993
Buku Teks
Giddings, J. Calvin, author
John Wiley & Sons, 1991
Buku Teks
Daniels, Joanne M.
Delmar Cengage Learning, 2006
Multimedia