APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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