The following are books that are by or about Ellers.
Books about Ellers
George Michael Eller and his Descendants
by James W. Hook
(digitized by Hathitrust)
History of the Eller Family
by J.W. Eller
(Focus on Christian Eller Line)
Descendants of George Michael Eller (1722-1778)
by Roger foster and Julia Sanders Eller
Online update to James W. Hook