Hollenweger suggested that the initial impulses gained from the Holiness movement, pacifism, women in leadership, interracial worship, identification with the poor including a critique of capitalism and ecumenism... were lost by later generations of Pentecostals. A number of Pentecostal scholars are working to rectify this situation today.
See, Walter J. Hollenweger, "An Introduction to Pentecostalisms," Journal of Beliefs & Values, vol. 25, no. 2, August, 2004.
Donald W. Dayton has done much to connect Pentecostal History with its radical Holiness roots.
See, Christian T. Collins Winn, From The Margins: A Celebration Of The Theological Work Of Donald W. Dayton (2007, Wifp & Stock).
Cecil M. Robeck, Jr., The Azusa Street Mission & Revival (2006, Thomas Nelson).Allan Anderson, Spreading Fires: The Missionary Nature of Early Pentecostalism (2007, Orbis).