Hybels, Saundra, author
D. Van Nostrand, 1974
Buku Teks
Bambang Budi Hartono, author
Fakultas Teknik Universitas Indonesia, 2009
UI - Skripsi (Open)
Shiland, Betsy J. , author
Elsevier , 2012
Buku Teks
Aalseth, Patricia, author
Jones & Bartlett Learning, 2015
Buku Teks
Paivio, Allan, author
Oxford University Press, 1986
Buku Referensi