Datta, Kalikinkar, author
Munshiram Manoharal, 1976
Buku Teks
Epstein, T. Scarlett, author
Manchester University Press , 1962
Buku Teks
Dossani, Rafiq, author
American Management Association, 2008
eBooks
Rosen, George, author
University California Press, 1966
Buku Teks
Woytinsky, W.S., author
Harper & Brothers, 1957
Buku Teks