Gaya APA
Ludwing, E.
(1964).
Applied Process Design for Chem.&Petzs Chem. Plant I
(
--)
.
Texas:
gulf publishing.
Gaya MLA
Ludwing, Ernest.
"Applied Process Design for Chem.&Petzs Chem. Plant I".
--
Texas:
gulf publishing,
1964.
Text.