Singh, Karan
Oxfords University Press, 2003
Buku Teks
Ball, John
Oughtershaw Press, 1996
Buku Teks
De Leeuw, Hendrik
Hanover House, 1954
Buku Teks
Reid, Anthony, 1939-, author
John Wiley & Sons, 2015
Buku Teks
Cressey, George Babcock, 1896-1963, author
J.B. Lippincott, 1960
Buku Teks