Hoffmann-Jorgensen, J.
Chapman & Hall, 1994
Buku Teks SO
edited by G. Louchard and G. Latouche
Academic Press, 1983
Buku Teks SO
Mendenhall, William
Wadsworth , 1967
Buku Teks SO
Mendenhall, William
Wadsworth, 1969
Buku Teks SO
Hodges, J.L.
Holden-Day, 1967
Buku Teks SO