1. Shrieve’s Chemical Process Industries;Austin,1984
2. “Sodium Tripolyphosphate-Consumption Down, But United States and West Europe Still Biggest Producers.” Phosphorus and Potassium, No. 95, May/June (1978), 37-39.
3. Phosphoric Acid, Fertilizer Science and Technology Series, Vol. 1, Part 1 and 2.;Slack,1968
4. Phosphate and Phosphoric Acid, Fertilizer Science and Technology Series, Vol. 3;Becker,1983
5. Phosphoric Acid/Wet Process: What Process;Smith,1988