Institute For Scientific Co-operation. (1980). Economics. Laupp & Gobel, Tubingen.
Παραπομπή σε μορφή Chicago (17η εκδ.)Institute For Scientific Co-operation. Economics. Federal Republic of Germany: Laupp & Gobel, Tubingen, 1980.
Παραπομπή σε μορφή MLA (9th εκδ.)Institute For Scientific Co-operation. Economics. Laupp & Gobel, Tubingen, 1980.