Silverberg, Robert
Chilton Book, 1966
Buku Teks SO
Hole, Frank
Holt Renehart and Winston, 1966
Buku Teks SO
Sahoe P'yongnon, 2010
Buku Referensi
Watson, Patty Jo
Columbia University Press , ss 1971
Buku Teks SO
edited by R. Layton
Routledge, 1994
Buku Teks SO