APA

Hey M. H., . (1963). Appendix to the second edition of an index of mineral species and varieties. London: Trustees of the British Museum.

Chicago

Hey Max H, . 1963. Appendix to the second edition of an index of mineral species and varieties. London: Trustees of the British Museum.

Harvard

Hey M. H., . (1963). Appendix to the second edition of an index of mineral species and varieties. London: Trustees of the British Museum.

MLA

Hey Max H, . Appendix to the second edition of an index of mineral species and varieties. London: Trustees of the British Museum. 1963.