1 2 3 4 Morris, Marlene C.; McMurdie, Howard F.; Evans, Eloise H.; Paretzkin, Boris; Groot, Johan H. de; Hubbard, Camden R.; Carmel, Simon J. (tháng 6 năm 1976). “13”. Standard X-ray Diffraction Powder Patterns. 25. Washington: Institute for Materials Research National Bureau of Standards.