1. Kabekkodu S. (2011). “The Powder Diffraction File, PDF-4 + ,” Release 2011 published by the ICDD.
2. Jenkins R. and Smith D. K. (1996). “The powder diffraction file: past present and future,” J. Res. Natl. Inst. Stand. Technol. 101, 3–20. Available online at http://www.icdd.com/products/ICDD.PDF
3. PDF (or X-ray Diffraction Card Files) (1941) (ASTM, Philadelphia, PA, USA). The first six cards in each card file contains a short history of the file, the associated organizations of the Joint Committee on Chemical Analysis by X-ray Diffraction Methods, members of the Joint Committee and their affiliations. The original records are kept in the historical archives of the ICDD. For several years after publication of the first card set in 1941, the cards were referred to as “The Cards for the Identification of Crystalline Materials by the Hanawalt X-ray Diffraction Method”.
4. Hubbard C. R. (2001). “NIST/ICDD powder diffraction research: a continuing collaboration for nearly 50 years,” presented at the NIST Centennial Celebration Symposium, American Crystallographic Association, Los Angeles, CA, USA.
5. Hubbard C. R. (2000). “ICDD Reinvented,”; presented at the ICDD Workshop at EPDIC-7, Barcelona, Spain.