Breuning Madsen, H. (1986) “Northern ecology and resource management: memorial essays honouring Don Gill./Ed. by Rod Olson, Ross Hastings, Frank Geddes”., Geografisk Tidsskrift, 86. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/44365 (Set: 5 december 2025).