Duhigg, Charles, author
Heinemann, 2012
Buku Teks
Sexton, John, author
M. Evans and Company, 1986
Buku Teks
Rao,K. Sujatha, author
Oxford University Press, 2017
eBooks
Cochrane, Susan H., author
Johns Hopkins University Press, 1979
Buku Teks
Artikel Jurnal