Jo-Ellen Asbury & Martha Ann Carey 
Focus Group Research [PDF ebook] 

This volume provides a thorough introduction to creating and conducting focus group research projects. Carey and Asbury provide background on the history of focus groups then document the best practices in conducting a study using them. They also provide valuable advice on how to conduct a fair and accurate analysis of minorities and other vulnerable groups within the population at large. This book is an excellent introduction for any researcher looking to utilize focus groups in their next project.