APA (7th ed.) Citation

Merriam-Webster, Inc. (1988). Webster's guide to business correspondence. Merriam-Webster.

Chicago Style (17th ed.) Citation

Merriam-Webster, Inc. Webster's Guide to Business Correspondence. Springfield, Mass: Merriam-Webster, 1988.

MLA (9th ed.) Citation

Merriam-Webster, Inc. Webster's Guide to Business Correspondence. Merriam-Webster, 1988.

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