Gallwey, Timothy Josep, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Brewer, Richard, author
Saunders College Publishing, 1982
Buku Referensi
Deason, Temp R., author
Burgess, 1968
Buku Teks
Corbin, Charles B., author
McGraw-Hill, 2000
Buku Teks
Voight, Michael L., author
McGraw-Hill, 2014
Buku Teks