Gaya APA
Scientific Event Alert Network (SEAN) Bulletin Vol. 12, No. 2, February 28, 1987. ().
Washington:
Smithsonian Istitution.
Gaya MLA
Scientific Event Alert Network (SEAN) Bulletin Vol. 12, No. 2, February 28, 1987.
.
Washington:
Smithsonian Istitution,
.
.