"The Estrangement of Charles Eastman and Elaine Goodale Eastman: The Mystery of the 'Other Woman' Solved"
https://www.sdhspress.com/journal/south-dakota-history-40-3/the-estrangement-of-charles-eastman-and-elaine-goodale-eastman-the-mystery-of-the-other-woman-solved
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"The Estrangement of Charles Eastman and Elaine Goodale Eastman: The Mystery of the 'Other Woman' Solved"
by Theodore D. Sargent and Raymond Wilson
