look at her profile, notice that there are several items that have <ref>Rumbaugh, Ruth Woten. McClure Families of Allen, Paulding and Van Wert Counties Ohio. 1990. 125. Print.</ref>
when you save and look the the sources, you will see the reference as
1. Rumbaugh, Ruth Woten. McClure Families of Allen, Paulding and Van Wert Counties Ohio. 1990. 125. Print.
2.Rumbaugh, Ruth Woten. McClure Families of Allen, Paulding and Van Wert Counties Ohio. 1990. 125. Print.
3.Rumbaugh, Ruth Woten. McClure Families of Allen, Paulding and Van Wert Counties Ohio. 1990. 125. Print.
if you change one of them to
<ref name="tag">Rumbaugh, Ruth Woten. McClure Families of Allen, Paulding and Van Wert Counties Ohio. 1990. 125. Print.</ref>
then for all the other times you use that reference, mark it as
<ref name="tag"/> tag being whatever you want to use, it is only seen when editing the profile, so one could be "1920 US Census" another could be "SSDI" ,"FindAGrave", etc
now in the sources you will see it as
1.0 1.1 1.2 Rumbaugh, Ruth Woten. McClure Families of Allen, Paulding and Van Wert Counties Ohio. 1990. 125. Print.
when the same source is used in multiple places, such as SSI shown on birth date, birth place, death date, it makes things a lot cleaner, both in the edit bio and display of the profile.