APA (7th ed.) Citation

B. Klein & Company. Directory of mailing list houses. B. Klein and Company.

Chicago Style (17th ed.) Citation

B. Klein & Company. Directory of Mailing List Houses. New York: B. Klein and Company.

MLA (9th ed.) Citation

B. Klein & Company. Directory of Mailing List Houses. B. Klein and Company.

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