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Engel, Michael H.; Nagy, Bartholomew (29 de abril de 1982). «Distribution and enantiomeric composition of amino acids in the Murchison meteorite». Nature. 296 (5860): 837–840. Bibcode:1982Natur.296..837E. doi:10.1038/296837a0
Bada, Jeffrey L.; Cronin, John R.; Ho, Ming-Shan; Kvenvolden, Keith A.; Lawless, James G.; Miller, Stanley L.; Oro, J.; Steinberg, Spencer (10 de fevereiro de 1983). «On the reported optical activity of amino acids in the Murchison meteorite». Nature. 301 (5900): 494–496. Bibcode:1983Natur.301..494B. doi:10.1038/301494a0
Engel, Michael H.; Macko, S. A. (1 de setembro de 1997). «Isotopic evidence for extraterrestrial non-racemic amino acids in the Murchison meteorite». Nature. 389 (6648): 265–268. Bibcode:1997Natur.389..265E. PMID9305838. doi:10.1038/38460
Engel, Michael H.; Macko, S. A. (1 de setembro de 1997). «Isotopic evidence for extraterrestrial non-racemic amino acids in the Murchison meteorite». Nature. 389 (6648): 265–268. Bibcode:1997Natur.389..265E. PMID9305838. doi:10.1038/38460