Metatheria: Differenza bejn il-verżjonijiet

*Nowak, R. M., 1991: Walker's mammals of the World; Part 2.The Johns Hopkins University Press, Baltimore and London, 1991, xii-643-1629

 

*[http://209.85.135.104/search?q=cache:8D468ltSMOwJ:animaldiversity.ummz.umich.edu/site/accounts/information/Metatheria.html+metatheria&hl=mt&ct=clnk&cd=1&gl=mt Animal Diversity Web: sit b' paġna b'informazjoni fuq l-iunfraklassi Metatheria]

*[http://www.fmnh.helsinki.fi/users/haaramo/metazoa/Deuterostoma/Chordata/Synapsida/Metatheria/Metatheria_index.html Mikko's Phylogeny Archive: Il-gruppi prinċipali fl-infraklassi Metatheria]