Gray, J. M. Geodiversity: Valuing and conserving abiotic nature (Second edition.).
Chicago Edition CitationGray, J. M. Geodiversity: Valuing and Conserving Abiotic Nature. Second edition.
MLA Edition CitationGray, J. M. Geodiversity: Valuing and Conserving Abiotic Nature. Second edition.
Warning: These citations may not always be 100% accurate.