Gaya APA
Helmus, F, P.
(2008).
Process Plant Design
.
Germany:
Wiley-VCH Verlag GmbH & Co. KGaA.
Gaya MLA
Helmus, Frank, Peter.
"Process Plant Design".
Germany:
Wiley-VCH Verlag GmbH & Co. KGaA,
2008.
.