APA (7th ed.) Citation
Willis, F. (1985). Western civilization: Obs. Vol.I.:, From ancient times through the seventeenth century, 683 s.. Vol.II.:, From the seventeenth century to the contemporary age, 559 s (4.ed.). D.C.Heath and Company.
Chicago Style (17th ed.) Citation
Willis, F.Roy. Western Civilization: Obs. Vol.I.:, From Ancient Times Through the Seventeenth Century, 683 S.. Vol.II.:, From the Seventeenth Century to the Contemporary Age, 559 S. 4.ed. Lexington: D.C.Heath and Company, 1985.
MLA (9th ed.) Citation
Willis, F.Roy. Western Civilization: Obs. Vol.I.:, From Ancient Times Through the Seventeenth Century, 683 S.. Vol.II.:, From the Seventeenth Century to the Contemporary Age, 559 S. 4.ed. D.C.Heath and Company, 1985.
Warning: These citations may not always be 100% accurate.