Cita APA (7a ed.)

Kessler, C. (1993). International Scientific Cooperation, Consolidated report of activities, 1987 - 90. s.n.

Cita Chicago Style (17a ed.)

Kessler, C. International Scientific Cooperation, Consolidated Report of Activities, 1987 - 90. s.l: s.n, 1993.

Cita MLA (9a ed.)

Kessler, C. International Scientific Cooperation, Consolidated Report of Activities, 1987 - 90. s.n, 1993.