Revised, updated, and expanded edition of Ashley's earlier work, History of the science fiction magazine.
v. 1. The time machines : the story of the science-fiction pulp magazines from the beginning to 1950
v. 2. Transformations : The story of the science-fiction magazines from 1950 to 1970
v. 3. Gateways to forever : the story of the science-fiction magazines from 1970 to 1980.
The history of the science-fiction magazine by Michael Ashley. ISBN 9781846310034. Published by Liverpool University Press in 2000. Publication and catalogue information, links to buy online and reader comments.