MacDougall, Curtis D., author
Macmillan, 1963
Buku Teks
Charnley, Mitchell V., author
Holt, Rinehart and Wisnton, 1965
Buku Teks
MacDougall, Curtis D., author
Macmilan Co., 1972
Buku Teks
Fred Fedler ... [and others]
Fort Worth Harcourt Brace College , 1997
Buku Teks
Mac Dangall, Curtis D., author
Macmillan, 1967
Buku Teks