Hammer is also editor of several books, including "Polemical Encounters" (with Kocku von Stuckrad, Brill 2007), "The Invention of Sacred Tradition" (with James R. Lewis, Cambridge UP 2007), "Alternative Christs" (Cambridge UP 2009) and "Cambridge Companion to New Religious Movements" (with Mikael Rothstein, Cambridge UP 2012).
* Claiming Knowledge: Strategies of Epistemology from Theosophy to the New Age (2001),* Polemical Encounters (совместно с Kocku von Stuckrad, 2007),* The Invention of Sacred Tradition (совместно с James R. Lewis, 2007),* Alternative Christs (2009).