Jansson, A., Zucchetto, J., Emmelin, L. 1., Engquist, A. 1., Häger, S., Nantin, H., & Östblom, G. (1978). Energy, economic and ecological relationships for Gotland, Sweden: A regional systems study. Stockholm: Swedish Natural Science Research Council.

Jansson, Ann-Mari, James Zucchetto, Lars 1945- Emmelin, A. 1935- Engquist, Stefan Häger, Helena Nantin, and Göran Östblom. Energy, Economic and Ecological Relationships for Gotland, Sweden: A Regional Systems Study. Stockholm: Swedish Natural Science Research Council, 1978.

Jansson, Ann-Mari, et al. Energy, Economic and Ecological Relationships for Gotland, Sweden: A Regional Systems Study. Stockholm: Swedish Natural Science Research Council, 1978.