APA (7th ed.) Citation

Penning, P. (1966). Theory of X-ray diffraction in unstrained and lightly strained perfect crystals. Philips.

Chicago Style (17th ed.) Citation

Penning, P. Theory of X-ray Diffraction in Unstrained and Lightly Strained Perfect Crystals. Eindhoven: Philips, 1966.

MLA (9th ed.) Citation

Penning, P. Theory of X-ray Diffraction in Unstrained and Lightly Strained Perfect Crystals. Philips, 1966.