APA
(1977). Europa yearbook 1977 a world survey, Vol.1, Part 1: International organizations, Part 2, Europe. London: Europa Publications.
Chicago
1977. Europa yearbook 1977 a world survey, Vol.1, Part 1: International organizations, Part 2, Europe. London: Europa Publications.
Harvard
(1977). Europa yearbook 1977 a world survey, Vol.1, Part 1: International organizations, Part 2, Europe. London: Europa Publications.
MLA
Europa yearbook 1977 a world survey, Vol.1, Part 1: International organizations, Part 2, Europe. London: Europa Publications. 1977.