[publisher not identified], [date of publication not identified]
Naskah
Leo, Alan
Sagar Publications, 1970
Buku Teks
Orr, Marjorie
Abdi Tandur, 1994
Buku Teks
Beck, Roger
Blackwell Publishing, 2007
Buku Teks
[publisher not identified], [date of publication not identified]
Naskah