Scott, Walter Dill, author
McGraw-Hill, 1959
Buku Teks
Strauss, George, author
Prentice Hall of India, 1985
Buku Teks
Strauss, George, author
Prentice-Hall, 1980
Buku Teks
Straus, George, author
Prentice-Hall, 1967
Buku Teks
Dickmann, Robert A., author
Wiley-Interscience, 1971
Buku Teks