Helm, M., & Helm, A. L. (2014). Genealogy online for dummies (Seventh edition.). John Wiley & Sons, Inc..
Chicagoスタイル(17版)引用形式Helm, Matthew, , April Leigh Helm. Genealogy Online for Dummies. Seventh edition. Hoboken, New Jersey: John Wiley & Sons, Inc., 2014.
MLA(9版)引用形式Helm, Matthew, , April Leigh Helm. Genealogy Online for Dummies. Seventh edition. John Wiley & Sons, Inc., 2014.
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