The Time Machines : The Story of the Science-Fiction Pulp Magazines from the beginning to 1950 - Ashley, Michael; Ashley, Michael (Liverpool : Liverpool University Press, 2000)
v. 1. The history of the science-fiction magazine -- v. 2. Transformations -- v. 3. Gateways to forever.
Revised, updated, and expanded edition of Ashley's earlier work, History of the science fiction magazine.
Includes bibliographical references and index.
Keywords: Science fiction, American -- History and criticism; Science fiction, English -- History and criticism; Science fiction -- Publishing -- United States -- History -- 20th century; Science fiction -- Publishing -- Great Britain -- History -- 20th century; Science fiction -- Periodicals -- History