Try some of these:

Books:

Lovell, John Jr. "Black Song: The Forge And The Flame" The Story Of How The Afro American Spiritual was Hammered Out, (Macmillan, 1972)

Higginson, Thomas Wentworth "Army Life In A Black Regiment" (Wherein a white officer "collects" tunes heard in the camp of the Ist South Carolina Infantry. Specifically, Chapter 9, "Negro Spirituals")

Joyner, Charles "Down By The Riverside:A South Carolina Slave Community" (U. of Illinois Press 1984-Specifically Chapter 5, "Come By Here, Lord" Includes information on how English-born Alexander Glennie first set up an Episcopal mission to the plantations of All Saints Parish and the spread and merger with existing cultures, as well as some song lyrics.)

LP:

An Introduction To Gospel Song comp. and edited by Samuel B. Charters
(RBF Records RBF 5-Issued through Folkways, so if not reissued yet, can be ordered as a custom tape or CD from them)

CD:

The English labels JSP and Proper specialize in reissuing old music at affordable prices in boxes sets, all with dates and annotation.

JSP7733 "Spreading The Word:Early Gospel Recordings (4 CDs-105 cuts)
JSP7737 "Blind Willie Johnson and the Guitar Evangelists" (4 CDs-96 cuts)
JSP7755 "Mountain Gospel: The Sacred Roots Of Country Music" (4 CDs-100 cuts)

www.jsprecords.com

PROPERBOX42 "Good News-100 Gospel Greats" ((4CDs)
PROPERBOX51 "Sister Rosetta Tharpe: The Original Soul Sister (4CDs)


www.propermusic.com

I didn't see them listed previously. Sorry if I duplicated anything.
Hope this stuff might help.