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xiii Acknowledgments A number of individuals assisted the editors and authors in the creation of this sixth edition of Reference and Information Services. We would like here to express our gratitude for their valuable contributions. First, we would like to thank the editorial and production staff of Libraries Unlimited, an imprint of ABC-CLIO, for their support in publishing this new edition. The authors of several chapters in the sixth edition built on the work of authors who had contributed to previous editions. We would like to acknowledge our debt to Marcia A. Brandt, Rick Burke, David A. Cobb, Prudence W. Dalrymple, Eric Forte, Jim Hahn, Frances Jacobson Harris, Wendy Holliday, Jenny Marie John- son, Josephine Z. Kibbee, Kathleen M. Kluegel, Elizabeth Leonard, Mary Mallory, Lori S. Mestre, Carol Bates Penka, Richard E. Rubin, Joseph E. Straw, Rosalind Tedford, Jo Bell Whitlatch, Lynn Wiley, and Beth S. Woodward for helping shape earlier editions of this text. Thanks go to Corinne M. Henderson for creating the reference interview figure in Chapter 3, Holly Soboroff for creating the Venn diagram figures in Chapter 16, and Matthew Beth for his assistance. We are deeply indebted to Richard E. Bopp (1944–2011) and Linda C. Smith. Rich first proposed the idea of a collaboratively authored reference textbook in the late 1980s and served as the lead editor for the first four editions published in 1991, 1995, 2001, and 2011. Linda C. Smith served as coeditor from the launch of the textbook in 1991 through the fifth edition in 2016. Through their diligent work and persistent effort, these authors created a seminal textbook that has served as the foundation for countless library careers. We are honored to carry on Rich and Linda’s legacy. Finally, we would like to extend a special thank-you to Blanche Woolls, who served as editor for the fourth through sixth editions and who pro- vided invaluable advice and guidance on this sixth edition, as she did for so many authors during her time at Libraries Unilimited.