Singapore Book Publishers Association. Directory of members - Singapore Book Publishers Association. Singapore Book Publishers Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Singapore Book Publishers Association. Directory of Members - Singapore Book Publishers Association. [Singapore]: Singapore Book Publishers Association.
Παραπομπή σε μορφή MLA (8th εκδ.)Singapore Book Publishers Association. Directory of Members - Singapore Book Publishers Association. Singapore Book Publishers Association.
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