Millard, Thomas F.
ABC Press, 1931
Buku Teks
Dernburg, Thomas F.
McGraw-Hill, 1985
Buku Teks
Gordon, Bernard K.
Prentice-Hall, 1966
Buku Teks
edited by Neera Chandhoke, Sanjay Kumar Agrawal
Routledge, 2013
Buku Teks
Nigel J. D. Lucas, Jayaprakasan Ambali, Enggene Chang, Marinette S. Forbes-Ricarte, Ram Manohar Shrestha
McGraw-Hill, 1987
Buku Referensi