APA (7th ed.) Citation

Hygienic Laboratory (U.S.) & ProQuest (Firm). (1920). Hygienic laboratory -- Bulletin No. 122 July, 1920. [publisher not identified].

Chicago Style (17th ed.) Citation

Hygienic Laboratory (U.S.) and ProQuest (Firm). Hygienic Laboratory -- Bulletin No. 122 July, 1920. Washington: [publisher not identified], 1920.

MLA (9th ed.) Citation

Hygienic Laboratory (U.S.) and ProQuest (Firm). Hygienic Laboratory -- Bulletin No. 122 July, 1920. [publisher not identified], 1920.

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