Skinner, Andrew S.
Clarendon Press, 1979
Buku Teks SO
[publisher not identified], [date of publication not identified]
Naskah
Berlin Volk und Wissen Volkseigener c1962
Buku Teks
[publisher not identified], [date of publication not identified]
Naskah
[publisher not identified], [date of publication not identified]
Buku Klasik