My father H.D. Johns wrote Serendipity as his reflection on what he had learned about people, relationships, and the art of psychotherapy throughout fifty years of experience as a psychotherapist.
John Gottman poured 40 years of research and insight, for what makes good marriages good, into 'The Seven Principles'. It's like an owner's manual for your relationship.
Dan Wile's final book was published posthumously with the help of his wife, therapist Dorothy Kaufmann. The definitive resource for Collaborative Couple Therapy. (Only available at Amazon.com)