Sardinas, Joseph L., author
John Wiley & Sons, 1981
Buku Teks
Porter, W. Thomas, author
Kent, 1981
Buku Teks
Watne, Donald A., author
Prentice-Hall, 1990
Buku Teks
Porter, W. Thomas, author
PWS-Kent , 1987
Buku Teks
Watne, Donald A., author
Prentice-Hall, 1984
Buku Teks