Adamson, Lee J., author
Ronald Press, 1964
Buku Teks
Velimsky, Vitezelav
General secretariat of the ISSA, 1971
Buku Teks
Glein, George A., author
Prentice-Hall, 1972
Buku Teks
Gregory, Robert Henry, author
Wadsworth, 1963
Buku Teks
Popkin, Gary S., author
Mifflin Company, 1981
Buku Teks