Παραπομπή σε μορφή APA (7η εκδ.)

Bjornstad, D. J., & Kahn, J. R. (1996). The contingent valuation of environmental resources: Methodological issues and research needs. Edward Elgar.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Bjornstad, David J., και James R. Kahn. The Contingent Valuation of Environmental Resources: Methodological Issues and Research Needs. Cheltenham, UK; Brookfield, US: Edward Elgar, 1996.

Παραπομπή σε μορφή MLA (9th εκδ.)

Bjornstad, David J., και James R. Kahn. The Contingent Valuation of Environmental Resources: Methodological Issues and Research Needs. Edward Elgar, 1996.