The Development of Children's Friendships edited by Steven R. Asher and John M. Gottman, Children's Friendship Relations: A Meta-analytic Review by Andrew F. Newcomb and Catherine L. Bagwell, Friendships and Their Developmental Significance by Willard W. Hartup, Relationships and Development edited by Willard W. Hartup and Zick Rubin, How Children Become Friends by John M. Gottman, Friendships and Adaptation in the Life Course by Willard W. Hartup and Nan Stevens, The Psychology of Friendship Relations: Social Factors by Robert S. Albert and Thomas R. Brigante, Peer Interactions, Relationships, and Groups by Kenneth H. Rubin, William M. Bukowski and Jeffrey G. Parker, The Beginnings of Collaboration in Peer Interaction by Mina Verba, Positive Emotion and the Regulation of Interpersonal Relationships by Michelle N. Shiota, Belinda Campos, Dacher Keltner and Matthew J. Hertenstein, An Exploratory Comparison of Close Intracultural and Intercultural Friendships by William B. Gudykunst and Relational Communication in Computer‐mediated Interaction by Joseph B. Walther and Judee K. Burgoon.