Kooloos, J. G. M. (1986). Integration of feeding mechanisms in some Anseriform birds. s.n..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKooloos, Johannes Gijsberthus Maria. Integration of Feeding Mechanisms in Some Anseriform Birds. [Leiden?, Netherlands: s.n., 1986.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKooloos, Johannes Gijsberthus Maria. Integration of Feeding Mechanisms in Some Anseriform Birds. s.n., 1986.
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