Good, H. G.
A History of western education / H. G. Good
Macmillan, 1961
Buku Teks
CRC standard mathematical tables / edited by William H. Beyer.
CRC Press, 1978
Buku Teks SO
Cole, George Douglas Howard, 1889-1959
A century of co-operation / G. D. H. Cole
The Co-operative union Ltd., 1944
Buku Teks SO
R.G.H. Siu
The master manager / R. G. H. Siu.
McGraw-Hill, 1980
Buku Teks SO
Fisher, H.A.L.
A history of Europe / H. A. L. Fisher
Edward Arnold & Co., 1946
Buku Teks SO