Perry, John, author
McGraw-Hill, 1954
Buku Teks
Nankervis, Alan R., author
Thomas Nelson Australia, 1996
Buku Teks
Whyte, William Foote, author
Harper Row , 1955
Buku Teks
Prentice-Hall, 1949
Buku Teks
Gardner, Burleigh B., author
Irwin , 1955
Buku Teks