Helm, M., & Helm, A. L. (2014). Genealogy online for dummies (Seventh edition.). John Wiley & Sons, Inc..
芝加哥风格引文Helm, Matthew, 与 April Leigh Helm. Genealogy Online for Dummies. Seventh edition. Hoboken, New Jersey: John Wiley & Sons, Inc., 2014.
MLA引文Helm, Matthew, 与 April Leigh Helm. Genealogy Online for Dummies. Seventh edition. John Wiley & Sons, Inc., 2014.
警告：这些引文格式不一定是100％准确.