John Gottman’s book for building a successful marriage is a must-read for most couples in my practice. It’s loaded with practical evaluations, exercises and advice. He is quite frank in his serious warnings for relationship pitfalls – eg. the chapter on the “seven horsemen of the apocalypse” – but I think the book is quite hopeful.
In addition to his own practice as a marriage therapist, he’s been doing research for the past two decades.
Not only do I subscribe to his research, but I have pursued some training from him and have incorporated much into my own approach. You can find his The Seven Principles for Making Marriage Work: A Practical Guide from the Country’s Foremost Relationship Expert through Amazon and in most local bookstores.