APA (7th ed.) Citation

Heald, W. F. (1967). Sky Island. Van Nostrand Reinhold.

Chicago Style (17th ed.) Citation

Heald, Weldon Fairbanks. Sky Island. Princeton, N.J: Van Nostrand Reinhold, 1967.

MLA (9th ed.) Citation

Heald, Weldon Fairbanks. Sky Island. Van Nostrand Reinhold, 1967.

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