APA (7th ed.) Citation

Hudson, W. H. (1927). A crystal age / by W.H. Hudson. Duckworth.

Chicago Style (17th ed.) Citation

Hudson, W. H. A Crystal Age / by W.H. Hudson. Duckworth, 1927.

MLA (9th ed.) Citation

Hudson, W. H. A Crystal Age / by W.H. Hudson. Duckworth, 1927.

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