Gaya APA
Lukens, R, P. (1977).
1977 ANNUAL BOOK OF ASTM STANDARDS PART 23 .
Maryland:
America Societ for Testing and Materials.
Gaya MLA
Lukens, Robert, P..
"1977 ANNUAL BOOK OF ASTM STANDARDS PART 23".
Maryland:
America Societ for Testing and Materials,
1977.
Text.