Gaya APA

Ragatz, O, A, H, ;, K, M, W, ;, R, A. (1976). Chemical process principles part I: material and energy balances (ed. 2). New York: Wiley.

Gaya MLA

Ragatz, Olaf, A., Hougen, ;, Kenneth, M., Watson, ;, Roland, A.. "Chemical process principles part I: material and energy balances". ed. 2 New York: Wiley, 1976. Text.