Pounds, Norman J. G.
McGraw-Hill, 1972
Buku Teks SO
Mellor, Roy E.H.
Routledge, 1989
Buku Teks SO
Goblet, Y.M.
Prederick A. Praeger, 1955
Buku Teks SO
Flint, Colin
Pearson/Prentice Hall, 2007
Buku Teks SO
Flint, Colin
Taylor and Francis Group, 2018
Buku Teks SO