web sites
| 1 ☰ | Chapman Family Association (CFA) | www.chapmanfamilies.org | |
| 2 ☰ | International Society of Genetic Genealogy (ISOGG) | www.isogg.org | |
| 3 ☰ | Family Search | www.familysearch.org/ | |
| 4 ☰ | Family Tree DNA Learning Center | www.familytreedna.com/learn/dna-basics/ | |
| 5 ☰ | DNAeXplained | dna-explained.com/ |
Reference