APA (7th ed.) Citation

Willits, C. O., & Hills, C. H. Maple sirup producers manual (Rev. June 1965, slightly rev. July 1976.).

Chicago Style (17th ed.) Citation

Willits, C. O., and Claude H. Hills. Maple Sirup Producers Manual. Rev. June 1965, slightly rev. July 1976.

MLA (9th ed.) Citation

Willits, C. O., and Claude H. Hills. Maple Sirup Producers Manual. Rev. June 1965, slightly rev. July 1976.