Ericksen, Julia A.; Ericksen, Eugene P.; Hostetler, John A.; Huntington, Gertrude E. (јул 1979). „Fertility Patterns and Trends among the Old Order Amish”. Population Studies. 33 (2): 255—76. ISSN0032-4728. JSTOR2173531. OCLC39648293. PMID11630609. doi:10.2307/2173531.
Francomano, Clair A.; McKusick, Victor A.; Biesecker, Leslie G. (15. 8. 2003). „Medical genetic studies in the Amish: Historical perspective”. American Journal of Medical Genetics (на језику: енглески). 121C (1): 1—4. ISSN0148-7299. PMID12888981. doi:10.1002/ajmg.c.20001.
„Population Trends 1992–2008”. Young Center for Anabaptist and Pietist Studies, Elizabethtown College. Архивирано из оригинала 6. 6. 2009. г. Приступљено 8. 7. 2009.
Ericksen, Julia A.; Ericksen, Eugene P.; Hostetler, John A.; Huntington, Gertrude E. (јул 1979). „Fertility Patterns and Trends among the Old Order Amish”. Population Studies. 33 (2): 255—76. ISSN0032-4728. JSTOR2173531. OCLC39648293. PMID11630609. doi:10.2307/2173531.
Ericksen, Julia A.; Ericksen, Eugene P.; Hostetler, John A.; Huntington, Gertrude E. (јул 1979). „Fertility Patterns and Trends among the Old Order Amish”. Population Studies. 33 (2): 255—76. ISSN0032-4728. JSTOR2173531. OCLC39648293. PMID11630609. doi:10.2307/2173531.
Francomano, Clair A.; McKusick, Victor A.; Biesecker, Leslie G. (15. 8. 2003). „Medical genetic studies in the Amish: Historical perspective”. American Journal of Medical Genetics (на језику: енглески). 121C (1): 1—4. ISSN0148-7299. PMID12888981. doi:10.1002/ajmg.c.20001.
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„Population Trends 1992–2008”. Young Center for Anabaptist and Pietist Studies, Elizabethtown College. Архивирано из оригинала 6. 6. 2009. г. Приступљено 8. 7. 2009.
Ericksen, Julia A.; Ericksen, Eugene P.; Hostetler, John A.; Huntington, Gertrude E. (јул 1979). „Fertility Patterns and Trends among the Old Order Amish”. Population Studies. 33 (2): 255—76. ISSN0032-4728. JSTOR2173531. OCLC39648293. PMID11630609. doi:10.2307/2173531.
Francomano, Clair A.; McKusick, Victor A.; Biesecker, Leslie G. (15. 8. 2003). „Medical genetic studies in the Amish: Historical perspective”. American Journal of Medical Genetics (на језику: енглески). 121C (1): 1—4. ISSN0148-7299. PMID12888981. doi:10.1002/ajmg.c.20001.