Gaya APA

Swanson, C, P., E., I, D, G. (NULL). The world almanac and book of facts 1977 . New: New York: Newspaper; 1977.

Gaya MLA

Swanson, Carl, P.., E., I., Delury,, George. "The world almanac and book of facts 1977". New: New York: Newspaper; 1977, NULL. Text.