Gaya APA
Nature/science annual. (1971).
New York:
Time - life.
Gaya Chicago
Nature/science annual.
1972.
New York:
Time - life,
1971.
Reference.
Gaya MLA
Nature/science annual.
1972.
New York:
Time - life,
1971.
Reference.
Gaya Turabian
Nature/science annual.
New York:
Time - life,
1971.
Reference.