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Janzen et al. 2009. Janzen, Daniel H. with the CBOL Plant Working Group; Forrest, L.L.; Spouge, J.L.; Hajibabaei, M.; Ratnasingham, S.; Van Der Bank, M.; Chase, M.W.; Cowan, R.S.; Erickson, D.L.; Fazekas, A.J.; Graham, S.W.; James, K.E.; Kim, K.-J.; Kress, W.J.; Schneider, H.; Van Alphenstahl, J.; Barrett, S.C.H.; Van Den Berg, C.; Bogarin, D.; Burgess, K.S.; Cameron, K. M.; Carine, M.; Chacon, J.; Clark, A.; Clarkson, J.J.; Conrad, F.; Devey, D.S.; Ford, C.S.; Hedderson, T.A.J.; Hollingsworth, M.L. (4 Ağustos 2009). "A DNA Barcode for Land Plants". Proceedings of the National Academy of Sciences. 106 (31): 12794-12797. Bibcode:2009PNAS..10612794H. doi:10.1073/pnas.0905845106. PMC2722355 $2. PMID19666622.
Janzen et al. 2009. Janzen, Daniel H. with the CBOL Plant Working Group; Forrest, L.L.; Spouge, J.L.; Hajibabaei, M.; Ratnasingham, S.; Van Der Bank, M.; Chase, M.W.; Cowan, R.S.; Erickson, D.L.; Fazekas, A.J.; Graham, S.W.; James, K.E.; Kim, K.-J.; Kress, W.J.; Schneider, H.; Van Alphenstahl, J.; Barrett, S.C.H.; Van Den Berg, C.; Bogarin, D.; Burgess, K.S.; Cameron, K. M.; Carine, M.; Chacon, J.; Clark, A.; Clarkson, J.J.; Conrad, F.; Devey, D.S.; Ford, C.S.; Hedderson, T.A.J.; Hollingsworth, M.L. (4 Ağustos 2009). "A DNA Barcode for Land Plants". Proceedings of the National Academy of Sciences. 106 (31): 12794-12797. Bibcode:2009PNAS..10612794H. doi:10.1073/pnas.0905845106. PMC2722355 $2. PMID19666622.