Coba jelasin Robert C. Binkley dari Harper (publisher) dong

Books in the United States

Cyclopædia of Biblical, Theological and Ecclesiastical Literature

Harper &amp; Row v. Nation Enterprises

Barnes, James J. "Edward Lytton Bulwer and the Publishing Firm of Harper & Brothers". American Literature (1966): 35–48. in JSTOR

D'Amato, Martina. "'The Harper Establishment'; or, How a New York Publishing Giant Was Made".

Exman, Eugene. The brothers Harper: a unique publishing partnership and its impact upon the cultural life of America from 1817 to 1853 (Harper & Row, 1965)

Mellman, John A. (2017), "The Harper Torchbooks Series: A History and Personal Assessment" , publishinghistory.com.