APA (7th ed.) Citation

ProQuest (Firm). (2019). ProQuest history vault. ProQuest.

Chicago Style (17th ed.) Citation

ProQuest (Firm). ProQuest History Vault. [Ann Arbor, Michigan]: ProQuest, 2019.

MLA (9th ed.) Citation

ProQuest (Firm). ProQuest History Vault. ProQuest, 2019.

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