ISBN:0-671-87617-1, $6.99
Paperback (August 1994)

DOI:0671876171, $5.00
eBook (December 2007)

ISBN:0-7434-3544-3, $7.99
Paperback (June 2002)

DOI:0743435443, $4.00
eBook (June 2002)

ISBN:0-671-31994-9, $6.99
Paperback (June 2001)

DOI:0671319949, $4.00
eBook (June 2001)

ISBN:0-671-57877-4, $6.99
Paperback (July 2000)

DOI:0671578774, $4.00
eBook (July 2000)

ISBN:0-671-57847-2, $6.99
Paperback (January 2000)

DOI:0671578472, $4.00
eBook (January 2000)

ISBN:0-671-87891-3, $5.99
Paperback (May 1998)

ISBN:0-671-87872-7, $5.99
Paperback (July 2000)

ISBN:0-671-87765-8, $5.99
Paperback (February 1997)