Freysen, A. H. J. (1978). Structure and functioning of plant populations. North-Holland Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFreysen, A. H. J. Structure and Functioning of Plant Populations. Amsterdam: North-Holland Publishing, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFreysen, A. H. J. Structure and Functioning of Plant Populations. North-Holland Publishing, 1978.
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