Creighton, Donald
Macmillan, 1981
Buku Teks SO
Careless, J.M.S.
Macmillan, 1959
Buku Teks SO
Careless, J.M.S.
Cambridge University Press, 1953
Buku Teks SO
Careless, J.M.S.
Macmillan, 1984
Buku Teks SO
chapters by Edgar McInnis ... [et al.] ; edited by George W. Brown
University of California Press, 1953
Buku Teks SO