Baldock, Peter, author
McGraw-Hill, 2011
Buku Teks
Wilber, Donald N.
Princeton University Press, 1958
Buku Teks
Baldock, Peter, author
McGraw-Hill; Open University Press, 2011
Buku Teks
Nagendra, Harini, author
Oxford University Press, 2016
eBooks
Saul Carkiner, Patti Shank, editor
Pfeiffer , 2008
Buku Teks