HOUGEN, O. A., WATSON, K. M., & RAGATZ, R. A. (1945). Chemical process principles part 1: Material and energybalance.-- ed.2. JOhn Wiley and Sons.

HOUGEN, Olaf A., Kenneth M. WATSON, and Roland A. RAGATZ. Chemical Process Principles Part 1: Material and Energybalance.-- Ed.2. New York: JOhn Wiley and Sons, 1945.

HOUGEN, Olaf A., et al. Chemical Process Principles Part 1: Material and Energybalance.-- Ed.2. JOhn Wiley and Sons, 1945.