Enoch Wan and Linda Gross. This paper is a diachronic overview of Christian missions to diaspora groups in general and a synchronic study of current efforts in contemporary USA. Definitions and explanations of several key-terms are offered below for the sake of clarity.
http://ojs.globalmissiology.org/index.php/english/article/view/59/171
Relational Realism for Christian Ministry 關係論與基督教事工 