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Erickson, J. Irving (1976), Twice-Born Hymns and Erickson, J. Irving (1985), Sing it Again, pp. 9–10; from Bratt, Wally (Winter 2003), "On 'How Great Thou Art", Pietisten, 17 (2), retrieved 1 February 2009.
John Zell. "Tim Spencer". Mannamusicinc.com. Archived from the original on 21 August 2008. Retrieved 22 February 2012.
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Mike Callahan, David Edwards, and Patrice Eyries, "Sacred Records Album Discography"; "Sacred Records Album Discography". Archived from the original on 14 February 2009. Retrieved 2 February 2009. (last update: 17 April 2003) (accessed 2 February 2009).
