Marris, Robin, author
Free Press of Glencoe, 1964
Buku Teks
Cross, Rod, author
Martin Robertson, 1982
Buku Teks
Heimann, Eduard
Oxford University Press, 1959
Buku Teks
Florence, P. Sargant, author
Routledge & Kegan Paul, 1957
Buku Teks
Niwata, Noriaki
Society of business and commerce, Keio University, 1971
Buku Teks