Tønsberg, T. (1992). The sorediate and isidiate, corticolous, crustose Lichens in Norway. University, Botanical Garden and Museum.
Chicago-Zitierstil (17. Ausg.)Tønsberg, Tor. The Sorediate and Isidiate, Corticolous, Crustose Lichens in Norway. Oslo: University, Botanical Garden and Museum, 1992.
MLA-Zitierstil (9. Ausg.)Tønsberg, Tor. The Sorediate and Isidiate, Corticolous, Crustose Lichens in Norway. University, Botanical Garden and Museum, 1992.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.