APA (7th ed.) Citation

Dunkling, L. A. (1990). The Guinness book of beards and moustaches. Guinness Publishing.

Chicago Style (17th ed.) Citation

Dunkling, Leslie A. The Guinness Book of Beards and Moustaches. Enfield: Guinness Publishing, 1990.

MLA (9th ed.) Citation

Dunkling, Leslie A. The Guinness Book of Beards and Moustaches. Guinness Publishing, 1990.

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