I talked about Gottman’s book in an earlier post:

John M. Gottman who wrote an excellent and practical guide: The Seven Principles for Making Marriage Work. Since Gottman’s book is a “guide”, he has developed 7 principles that are expressed in the form of exercises. I recommend that any couple interested invest some time in these exercises. The exercises can be done by couples working on their own; the “guide” is in fact a good self-help manual.

It is still the best “couples” book I have found and I continue to use it in my practice.