Artikel Jurnal
by Harold C. Hinton ... [et al.]; edited by George McTurnan Kahin
Cornell University Press , 1958
Buku Teks
Auer, Joseph
Van Nostrand Reinhold, 1982
Buku Teks
Kuther, Tara L., editor
Wardworth, 2012
Buku Referensi
Berlmas, Genelle, author
Wadsworth and Cengage Learning, 2012
Buku Teks