[1] Astounding Science Fiction, September 1940 Copyright © 1940 by Street amp; Smith Publications, Inc. Copyright renewed © 1967 by Isaac Asimov
[2] Astonishing Stories, December 1940 Copyright © 1940 by Fictioneers, Inc. Copyright renewed © 1967 by Isaac Asimov
[3] Super Science Stones, November 1942 Copyright © 1942 by Fictioneers, Inc. Copyright renewed © 1969 by Isaac Asimov
[4] Astonishing Stones, April 1941 Copyright © 1941 by Fictioneers, Inc. Copyright renewed © 1969 by Isaac Asimov
[5] Super Science Stories, March 1941 Copyright © 1941 by Fictioneers, Inc. Copyright renewed © 1968 by Isaac Asimov
[6] Startling Stones, January 1942, Copyright © 1941 by Better Publications, Inc., Copyright renewed © 1968 by Isaac Asimov
[7] Fantasy Book, Volume 1, Number 6, Copyright © 1950 by Fantasy Publishing Company, Inc.
[8] Thrilling Wonder Stories, October 1942 Copyright © 1942 by Better Publications, Inc. Copyright renewed © 1969 by Isaac Asimov
[9] Astonishing Stories, September 1941 Copyright © 1941 by Fictioneers, Inc. Copyright renewed © 1968 by Isaac Asimov
[10] Does anyone know in what essay, and in what connection, Emerson says this? Every once in a while I make a desultory search through quotation books or through a collection of Emerson but haven't found it yet. I hope it exists and that the quote is "given correctly.
[11] 'Black Friar of the Flame' was three thousand words longer than 'Nightfall,' but the former was not to be sold for another half year, and since it earned merely one cent a word, it brought in only $161. Of course, first-time earnings are not the whole story, either. 'Nightfall' has earned me some thousands of dollars since 1941 and will yet earn me more; 'Black Friar of the Flame' has not yet earned me one cent over the original check - till its appearance in this book.
[12] In telling the story, in that collection, of how 'Nightfall' came to be written, I mentioned that I had received $150 for it, quoting from memory. Once again, I must confess fallibility. The records say $166. It is a small point, and perhaps not worth noting, but I know my readers. By explaining this now, I fend off dozens of letters that will mention the discrepancy and demand an explanation.
[13] Astounding Science Fiction, October 1941, Copyright © 1941 by Street amp; Smith Publications, Inc., Copyright renewed © 1968 by Isaac Asimov
[14] Weird Tales, September 1950 Copyright © 1950 by Weird Tales
[15] Astounding Science Fiction, April 1942, Copyright © 1942 by Street amp; Smith Publications, Inc.