Zou, Xiaodong, Sven Hovmöller, and Peter Oleynikov. "Fundamental crystallography." Electron Crystallography: Electron Microscopy and Electron Diffraction. : Oxford University Press, 2011-08-18. Oxford Scholarship Online. 2012-01-19. Date Accessed 18 Jun. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199580200.001.0001/acprof-9780199580200-chapter-2>.
Zou, X., Hovmöller, S., & Oleynikov, P.(2011-08-18). Fundamental crystallography. In Electron Crystallography: Electron Microscopy and Electron Diffraction. : Oxford University Press. Retrieved 18 Jun. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199580200.001.0001/acprof-9780199580200-chapter-2.
Zou, Xiaodong, Sven Hovmöller, and Peter Oleynikov. "Fundamental crystallography." In Electron Crystallography: Electron Microscopy and Electron Diffraction. : Oxford University Press, 2011-08-18. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199580200.001.0001/acprof-9780199580200-chapter-2.
Zou X, Hovmöller S, Oleynikov P. Fundamental crystallography. In: Zou X, Hovmöller S, Oleynikov P. Electron Crystallography: Electron Microscopy and Electron Diffraction. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199580200.001.0001/acprof-9780199580200-chapter-2. Accessed June 18, 2013.