1. 1981. Minerals Yearbook, 1980, Vol. 1, 29–49. Washington, D.C.: US Gov't. Ptg. Off. Staff, US Bureau of Mines
2. Apian , F. F ,
Chander , S.
Arnold , B. J. and
Riggs , W. F , eds. 1986. Chemical Reagents in the Mineral Processing Industry, 271–279. Littleton: Society of Mining Engineers. CO
3. Apian , F. F.
Somasundaran , P. and
Arbiter , N , eds. 1979. Benefication of Mineral Fines - Problems and Research Needs, 101–110. New York: AIME.
4. Perry , R. W.
Apian , F. F and
In Attia , Y. A , eds. 1985. Processing and Utilization of High Sulfur Coals, 183–238. Amsterdam: Elsevier.