Gaya APA
Leffler, William L. (1979).
PETROLEUM REFINING FOR THE NON-TECHNICAL PERSON .
:
Penwell publishing company.
Gaya Chicago
Leffler, William L.
PETROLEUM REFINING FOR THE NON-TECHNICAL PERSON.
:
Penwell publishing company,
1979.
Text.
Gaya MLA
Leffler, William L.
PETROLEUM REFINING FOR THE NON-TECHNICAL PERSON.
:
Penwell publishing company,
1979.
Text.
Gaya Turabian
Leffler, William L.
PETROLEUM REFINING FOR THE NON-TECHNICAL PERSON.
:
Penwell publishing company,
1979.
Print.