In 1993, William Sears and Martha Sears published The Baby Book which became the first comprehensive manual for AP-parents and which was occasionally dubbed "the attachment parenting bible".[13] The first attachment parenting organization, Attachment Parenting International, formed in 1994 in Alpharetta, Georgia and was founded by Lysa Parker and Barbara Nicholson.[14] The first book that carried the term attachment parenting in the title was written by Tammy Frissell-Deppe, a mother who gave an account of her personal experiences and of those of her friends and acquaintances.[15] In 1999, blogger Katie Allison Granju followed with another book,[16] to which William Sears contributed a foreword, before he, together with Martha Sears, published his own work, The Attachment Parenting Book in 2001. All three books stood – with their opposition against a crude behavioristic infant anthropology – in the tradition of Spock, but radicalized the concept of a contingency-oriented parenting on the one hand, and incorporated Liedloff’s idea of an instinct-guided resp. "natural" childrearing on the other hand.