Monte Cook, Jonathan Tweet, Skip Williams (September 2000). Dungeon Master's Guide 3rd edition. (Wizards of the Coast). ISBN 978-0786915514.
Cite book/Dungeon Master's Guide 3rd edition
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Monte Cook, Jonathan Tweet, Skip Williams (September 2000). Dungeon Master's Guide 3rd edition. (Wizards of the Coast). ISBN 978-0786915514.