John J. Collins, The Apocalyptic Imagination. Third ed. Grand Rapids: Eerdmans, 2016. Standard introduction to the genre.
John J. Collins, Apocalypse, Prophecy, and Pseudepigraphy. Essays on Jewish Apocalyptic Literature. Grand Rapids: Eerdmans, 2015. Essays on particular aspects of apocalyptic literature.
John J. Collins, ed., The Oxford Handbook of Apocalyptic Literature (New York: Oxford, 2014. Essays by various authors on different aspects of apocalyptism, ancient and modern.