Gaya APA
Scientific Event Alert Network (SEAN) Bulletin Volume 4, No. 11, November 30, 1979. ().
Washington:
Smithsonian Istitution.
Gaya MLA
Scientific Event Alert Network (SEAN) Bulletin Volume 4, No. 11, November 30, 1979.
.
Washington:
Smithsonian Istitution,
.
.