Swanson, H. E.; McMurdie, H. F.; Morris, M. C. & Evans, E. H. Standard X-ray Diffraction Powder Patterns: Section 7. Data for 81 Substances, report, September 1969; (https://digital.library.unt.edu/ark:/67531/metadc13215/m1/31/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .