APA-čujuhus (7. p.)
ebrary, Inc, Gutzman, A. D., & Holland, A. (2002). Top 25 case studies on marketing with email newsletters. MarketingSherpa, Inc..
Chicago-čujuhus (17. p.)
ebrary, Inc, Alexis D. Gutzman, juo Anne Holland. Top 25 Case Studies on Marketing with Email Newsletters. Portsmouth, R.I.: MarketingSherpa, Inc., 2002.
MLA-čujuhus (9. p.)
ebrary, Inc, et al. Top 25 Case Studies on Marketing with Email Newsletters. MarketingSherpa, Inc., 2002.
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