Burns, Robert
Collins, 1955
Buku Teks SO
Burns, Robert
Harper-Collins, 1995
Buku Teks SO
P. F. Collier & Son Corporation, 1959
Buku Referensi
Fitzhugh, T.R.
Chapel Hill Univ. of North Coalina Press 1943
Buku Teks
Burns, Danny, 1964-
MacMiland, 22cm
Buku Teks SO