Available Editions

Novel

Hardcover

Book cover for The Enemy Within
1987 Year
New Era Publications Publisher
ISBN-13: 978-87-7336-485-7
ISBN-10: 87-7336-485-1
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Paperback

Book cover for The Enemy Within
2013 Year
Galaxy Press Publisher
ISBN-13: 978-1-61986-176-3
ISBN-10: 1-61986-176-3
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Audio

No Cover
2006 Year
Galaxy Press Publisher
ISBN-13: 978-1-59212-194-6
ISBN-10: 1-59212-194-2
Not Available for Purchase

All-In-One

Audio

Book cover for Mission Earth Volumes 3 & 4: The Enemy Within & An Alien Affair
2012 Year
Galaxy Press Publisher
ISBN-13: 978-1-61707-078-5
ISBN-10: 1-61707-078-5
Not Available for Purchase