Gaya APA
Katz, D, L., Lee, R, L.
(1990).
Natural gas engineering.
(
1990)
.
:
New York : McGraw-Hill,.
Gaya MLA
Katz, Donald, L.., Lee, Robert, L..
"Natural gas engineering.".
1990
:
New York : McGraw-Hill,,
1990.
Text.