Walpole, Ronald E.
Macmillan, 1968
Buku Teks
Sigel, Andrew F.
John Wiley & Sons, 1996
Buku Teks
Hoel, Paul Gerhard, 1905-
John Wiley & Sons, 1962
Buku Teks
Freeman, Harold Adolph
Addison-Wesley, 1963
Buku Teks
Dobson, Annette
Chapman and Hall, 1983
Buku Teks