Location Portraits by Cathy Joseph is one of the books in the Professional Photography series by Rotovision.
Although the photography is excellent, this is not a coffee table book but an instructional guide on how to take portraits outside of a studio. Advice is given by experts in various fields including travel photographers, photo journalists and those who specialize in corporate portraits. As with other books published by Rotovision, Location Portraits includes the technical details for each shot including camera, lens, film etc and where relevant lighting diagrams.
Unfortunately this book is no longer in print but it is still available new or used and is well worth checking out. (There are used copies on Amazon for less that $4!) Enjoy.