“The Professional Photographer”, May 1980/37. |
“Encyclopedia of Practical Photography” vol. 13, pp 2456-2464. |
Leslie Stroebel, et al, “Photographic Materials and Processes”, 1986, p. 330. |
E.J. Wall, et al “Photographic Facts and Formulas”, 1976, p. 360. |
G. Haist, “Modern Photographic Processing”, vol. 2, pp 94-96. |
ST20—“Odourless Sepia Toner”, date unknown—prior to Apr. 2000. |
“Camera and DarkRoom”, Toner Formula, Sep., 1995, 65. |
BJP Annual 1968 p. 201. |
“Toning Kodak Black-and-White Materials”, G-23, Eastman Kodak Company, 1989. |