Kern, R.A., author
[publisher not identified], [date of publication not identified]
Buku Klasik
Reinsma, Riemer, author
Atlas, 2009
Buku Referensi
Angus and Robertson, 1957
Buku Teks SO
[publisher not identified], [date of publication not identified]
Naskah
[publisher not identified], [date of publication not identified]
Naskah