Wal, H. R. v. d. (1979). Results and pitfalls of electron density studies by x-ray diffraction. Rijksuniversiteit te Groningen.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWal, Hanno Rudolf van der. Results and Pitfalls of Electron Density Studies by X-ray Diffraction. Netherlands: Rijksuniversiteit te Groningen, 1979.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWal, Hanno Rudolf van der. Results and Pitfalls of Electron Density Studies by X-ray Diffraction. Rijksuniversiteit te Groningen, 1979.
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