What are sourcebooks?

Some articles on sourcebooks:

Frank Deford - Published Works
... Publisher, Triumph Books (2000) ISBN 1-57243-360-4 The Other Adonis A Novel (2001) Sourcebooks Landmark, ISBN 1-4022-0011-0 An American Summer A Novel (2002) Sourcebooks Landmark ...
Catherine Levison - Book Titles
... A Charlotte Mason Education A How-to Manual, ISBN 1-891400-16-9 (SourceBooks) More Charlotte Mason Education, ISBN 1-891400-17-7 (SourceBooks) A Literary Education An Annontated Book List, ISBN 1-891400-23-1 (SourceBoo ...
Tim Sandlin - Bibliography - Novels
... Sex and Sunsets, 1987, current reprint by Sourcebooks Landmark Western Swing, 1988, current reprint by Sourcebooks Landmark Skipped Parts, 1992, current reprint by Sourcebooks Landmark Sorrow Floats ... ISBN 978-1-59448-974-7 Lydia, Sourcebooks Landmark, 2011, ISBN 978-1-4022-4181-9 ...