Friedman, Thomas L.
Penguin Book, 2006
Buku Teks SO
Al-Suwaidi, Jamal Sanad
Jamal Sanad Al-Suwaidi, 2018
Buku Teks SO
edited by Florence S. Gordon and Sheldon Gordon
Mathematical Association of America, 1992
Buku Teks SO
edited by George Gerbner, Richard B. Byrne
John Wiley & Sons, 1981
Buku Teks
Russel, Fox Hon
Covendish Publishing Limited, 2000
Buku Teks