Love, Clyde E., author
Macmillan, 1943
Buku Teks
Seeley, Robert T., author
Scott Foresman and Company, 1968
Buku Teks
Borden, Robert S., author
North-Holland, 1983
Buku Teks
Small, Donald B., author
McGraw-Hill, 1990
Buku Teks
Hoffman, Laurence D., author
McGraw-Hill, 1975
Buku Teks