McConnell, Charles R., author
Jones and Bartlett, 2011
Buku Teks
Lyles, Richard I
John Wiley , 1986
Buku Teks
Nancy Borkowski, Gloria Deckard, editor
Jones and Bartlett Publishers, 2014
Buku Teks
edited by Leslie Neal-Boylan
Wiley-Blackwell, 2011
Buku Teks
Gray, Ivan, author
Learning matters Ltd., 2010
Buku Teks