APA (7th ed.) Citation

Sinclair, H. M. (1934). A preface to economic history. Harper.

Chicago Style (17th ed.) Citation

Sinclair, Huntly Macdonald. A Preface to Economic History. New York: Harper, 1934.

MLA (9th ed.) Citation

Sinclair, Huntly Macdonald. A Preface to Economic History. Harper, 1934.