APA (7th ed.) Citation

Underwriters' Laboratories. (1974). Quarterly supplement to annual product directories. [Underwriters' Laboratories].

Chicago Style (17th ed.) Citation

Underwriters' Laboratories. Quarterly Supplement to Annual Product Directories. Chicago: [Underwriters' Laboratories], 1974.

MLA (9th ed.) Citation

Underwriters' Laboratories. Quarterly Supplement to Annual Product Directories. [Underwriters' Laboratories], 1974.

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