(1968). Cassell's directory of publishing: In Great Britain, the Commonwealth, Ireland and South Africa / (5th ed.). London: Cassell.
Παραπομπή Chicago StyleCassell's Directory of Publishing: In Great Britain, the Commonwealth, Ireland and South Africa /. 5th ed. London: Cassell, 1968.
Παραπομπή MLACassell's Directory of Publishing: In Great Britain, the Commonwealth, Ireland and South Africa /. 5th ed. London: Cassell, 1968.
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