DEPRESSION: HOW IT HAPPENS, HOW IT'S HEALED. John Medina, PhD. CME New Harbinger Publications, 1998,146 pp. $14.95. Reviewed by Mildred V. Waller. FULL CIRCLE: SPIRITUAL THERAPY FOR THE ELDERLY. Kevin Kirkland and Howard McIlveen. New York: The Haworth Press, Inc. 1999, 205 pp., $14.95 text, $29.95 hardbound. Reviewed by Carmen S. Bowman. AGING AND MALE SEXUALITY. R. C. Schiavi (1999). New York: Cambridge University Press, ISBN 0521653916 253p. (pb) $49.95. Reviewed by Michael R. Maples. HE USED TO BE SOMEBODY: A JOURNEY INTO ALZHEIMER'S DISEASE THROUGH THE EYES OF A CAREGIVER. Beverley Big-tree Murphy. Gibbs Associates, Boulder, CO, 1995, 348 pp. $16.95 Softcover. Reviewed by Lenore B. Weinstein.