Clearing House for Social Development in Asia, Voelker, G., & Tai Ching Ling. (1975). Social development in Singapore: Gottfried Voelker, Tai Ching Ling. Friedrich Ebert-Stiftung,--Vol. 1.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रClearing House for Social Development in Asia, Gottfried Voelker, और Tai Ching Ling. Social Development in Singapore: Gottfried Voelker, Tai Ching Ling. Bangkok: Friedrich Ebert-Stiftung,--Vol. 1, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रClearing House for Social Development in Asia, et al. Social Development in Singapore: Gottfried Voelker, Tai Ching Ling. Friedrich Ebert-Stiftung,--Vol. 1, 1975.
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