Exman, E. (1967). The house of Harper: One hundred and fifty years of publishing. Harper & Row.
Citazione stile Chigago Style (17a edizione)Exman, Eugene. The House of Harper: One Hundred and Fifty Years of Publishing. New York [u.a.]: Harper & Row, 1967.
Citatione MLA (8a ed.)Exman, Eugene. The House of Harper: One Hundred and Fifty Years of Publishing. Harper & Row, 1967.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.