Gaya APA
Company, I., M., B. (1960).
McGraw-Hill Encyclopedia of Science and Technology 6 gab - hys .
USA:
McGaw-ill Book Company.
Gaya MLA
Company, I., M., B..
McGraw-Hill Encyclopedia of Science and Technology 6 gab - hys.
USA:
McGaw-ill Book Company,
1960.
Lawas.