Barth, Friedrich G., 1940-
Springer, 2003
Buku Referensi
University of Chicago Press, 1970
Buku Referensi
Hart, Franz
Nichols Pub. Co, 1985
Buku Teks SO
Wainwright, W. Howard
Hutchinson Technical Education , 1963
Buku Teks SO
Wriggins, W. Howard
Princeton University Press, 1960
Buku Teks SO