Grogono, Peter, author
PBI, 1983
Buku Teks
Sargent III, Murray, author
Addison-Wesley, 1981
Buku Teks
edited by Joan Davidson and Richard Lloyd
John Wiley & Sons, 1979
Buku Teks
Hammonds, Carsie, 1894-, author
Mcgraw-Hill , 1950
Buku Teks
Larson, Adlowe L., author
Prentice-Hall, 1957
Buku Teks