ISBN:0-671-65384-9, $5.99
Paperback (February 1988)

DOI:9781618240446, $6.00
eBook (February 2012)

ISBN:0-671-72130-5, $5.99
Paperback (July 1992)

DOI:9781618240453, $6.00
eBook (February 2012)

ISBN:0-671-65583-3, $6.99
Paperback (August 1986)

DOI:0671655833, $5.00
eBook (June 2006)

ISBN:0-7434-8823-7, $25.00
Hardcover (May 2004)

DOI:0743488237, $9.99
eBook (May 2003)

ISBN:0-7434-8816-4, $24.00
Hardcover (April 2004)

ISBN:1-4165-0903-8, $7.99
Paperback (September 2005)

DOI:0743488164, $6.99
eBook (April 2003)

ISBN:0-7434-7169-5, $6.99
Paperback (November 2003)

DOI:0743471695, $6.99
eBook (October 2001)

ISBN:0-671-31842-X, $6.99
Paperback (October 2001)

DOI:067131842X, $6.99
eBook (October 2001)

ISBN:0-671-31987-6, $7.99
Paperback (December 2000)

DOI:0671319876, $4.00
eBook (December 2000)

ISBN:0-671-57783-2, $6.99
Paperback (January 1999)

DOI:0671577832, $5.00
eBook (January 1999)

ISBN:0-671-57824-3, $6.99
Paperback (August 1999)

DOI:0671578243, $5.00
eBook (September 2006)

ISBN:0-671-87764-X, $5.99
Paperback (January 1997)

DOI:067187764X, $5.00
eBook (September 2006)

ISBN:0-671-87674-0, $5.99
Paperback (July 1995)

DOI:0671876740, $4.00
eBook (October 2001)

ISBN:0-671-69851-6, $4.99
Paperback (April 1992)

DOI:0671698516, $5.00
eBook (October 2001)

ISBN:0-671-72065-1, $5.99
Paperback (January 1996)

ISBN:0-671-72155-0, $4.99
Paperback (February 1993)