Gaya APA
Nature/ science annual 1971. (1970).
Canada:
Time.
Gaya Chicago
Nature/ science annual 1971.
1971.
Canada:
Time,
1970.
Reference.
Gaya MLA
Nature/ science annual 1971.
1971.
Canada:
Time,
1970.
Reference.
Gaya Turabian
Nature/ science annual 1971.
Canada:
Time,
1970.
Reference.