Gatrall, M., Jenkyns, H., & Parsons, C. (1972). LIMONITIC CONCRETIONS FROM EUROPEAN JURASSIC, WITH PARTICULAR REFERENCE TO SNUFF-BOXES OF SOUTHERN ENGLAND.
Chicago-referens (17:e uppl.)Gatrall, M., H. Jenkyns, och C. Parsons. LIMONITIC CONCRETIONS FROM EUROPEAN JURASSIC, WITH PARTICULAR REFERENCE TO SNUFF-BOXES OF SOUTHERN ENGLAND. 1972.
MLA-referens (9:e uppl.)Gatrall, M., et al. LIMONITIC CONCRETIONS FROM EUROPEAN JURASSIC, WITH PARTICULAR REFERENCE TO SNUFF-BOXES OF SOUTHERN ENGLAND. 1972.
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