Luchins, Abraham S., author
Holt, Rinehart and Winston, 1965
Buku Teks
Mott, Joe L., author
Reston Publishing, 1983
Buku Teks
Stein, Clifford, author
Pearson, 2011
Buku Teks
Leavitt, Fred, author
C. Brown Publishers , 1991
Buku Teks
Buchanan, James M., author
Liberty Fund, 1971
Buku Teks