Barney, G. O., Blewett, J., & Barney, K. R. (1998). Threshold 2000: Critical issues and spiritual values for a global age. Millennium Institute ; CoNexus Press.
Čikaški stil citiranja (17. izdanje)Barney, Gerald O., Jane Blewett, i Kristen R. Barney. Threshold 2000: Critical Issues and Spiritual Values for a Global Age. Arlington, VA : Grand Rapids: Millennium Institute ; CoNexus Press, 1998.
MLA način citiranja (8. izdanje)Barney, Gerald O., et al. Threshold 2000: Critical Issues and Spiritual Values for a Global Age. Millennium Institute ; CoNexus Press, 1998.
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