edited Max D. Richards and William A. Nielander
South-Western Publishing, 1958
Buku Teks
Hicks, Herbert G., author
McGraw-Hill Kogakusha, 1974
Buku Teks
This, Leslie E.
Addison-Wesley Pub. Co. , 1974
Buku Teks
Cerami, Charles A., author
Prentice-Hall, 1957
Buku Teks
Hodges, Henry G., author
Houghton Miffiln, 1955
Buku Teks