LC manual auth. cd. (hdg.: Aitken, William Hay Macdowall Hunter, 1841-1927; usage: Rev. W. Hay M. H. Aitken, W.H.M.H. Aitken; British clergyman and author)
NUCMC data from Library of Congress Manuscript Division for His Signature, n.d. (Aitken, William Hay Macdowell Hunter, 1841-1927; clergyman)