Carole Lium Edelman, Elizabeth Connelly Kudzma, Carol Lynn Mandle, editors
Elsevier, 2014
Buku Teks
Edberg, Mark Cameron, 1955-, author
Jones & Bartlett Learning, 2015
Buku Teks
edited by Edwin D. Kilbourne, Wilson G. Smillie
MacMillan company, 1969
Buku Teks
WB. Saunders, 1965
Buku Teks
Australian Government Publishing Service , 1986
Buku Teks