edited by Frank N. Magill
Salem Press, 1992
Buku Referensi
edited by Frank N. Magill
Salem Press, 1992
Buku Referensi
Tillery, Bill W., author
McGraw-Hill, 2012
Buku Teks
Booth, Verne H., author
Macmillan, 1969
Buku Teks
Swenson, Hugo N., author
John Wiley & Sons, 1957
Buku Teks