APA (7th ed.) Citation

Rutland, E. H. (1974). An introduction to the world's gemstones / (by) E.H. Rutland. Country Life Books.

Chicago Style (17th ed.) Citation

Rutland, Ernest Hugo. An Introduction to the World's Gemstones / (by) E.H. Rutland. London: Country Life Books, 1974.

MLA (9th ed.) Citation

Rutland, Ernest Hugo. An Introduction to the World's Gemstones / (by) E.H. Rutland. Country Life Books, 1974.

Warning: These citations may not always be 100% accurate.