In my opinion (and as the co-editor of three volumes of textbooks in this area - (Pink Therapy: A Guide for Counsellors and Therapists Working with Lesbian, Gay and Bisexual Clients
and Therapeutic Perspectives On Working With Lesbian, Gay and Bisexual Clients (Pink Therapy)
, and Issues In Therapy With Lesbian, Gay, Bisexual And Transgender Clients
), but THIS book by Professor Carroll is one of the very best books on the market in working with LGBT clients.
The level of detail and referencing is awesome and the trouble the author has gone to in suggesting self directed learning exercises, makes this book wonderful for self study and when very little is ever taught on working with LGBT clients in therapy programmes this book can provide essential insights
I've been training therapists to work with LGBT populations for 30 years and if I had to recommend just one book, THIS would be it. It's reasonably priced, available in paperback and does not push an overly Americanised cultural perspective (i.e. the author does not assume sobriety and abstinence as the only effective treatment for addictions). I've adopted this book as the CORE text for our one year professional training in working with gender and sexual minorities
The book also makes clear distinctions between gender minorities and the LGB population and doesn't assume they are the same. She's gone to considerable trouble to show us how these populations are similar AND different.