Gaya APA
Lemoff, T, C., Hammaker, F, G.
(1988).
National fuel gas code.
(
1988)
.
:
Arlington : AGA- NFPA,.
Gaya MLA
Lemoff, Theodore, C.., Hammaker, Forrest, G..
"National fuel gas code.".
1988
:
Arlington : AGA- NFPA,,
1988.
Text.