hrvatskom jeziku Wikipedia na bosanskom jeziku http://en.wikipedia.org/w/index.php?diff=263549&oldid=263548 (Pristupljeno 21:31, 16. 1. 2002) "Gmane Loom"
in/category/johann-wolfgang-von-goethe-quotes-sayings http://www.goetheanscience.org/index.php Nedovršeni članak Johann Wolfgang von Goethe koji govori o biografijama
Lehninger Principles of Biochemistry. W. H. Freeman and Co., ISBN 978-1-4641-0962-1. http://www.etymonline.com/index.php?term=ketone Online Etymology Dictionary
Archaeothyris Echinerpeton Karbon Misisipij http://www.stratigraphy.org/index.php/ics-chart-timescale Global Boundary Stratotype Section and Point (GSSP)