Cite
50 & 100 years ago.
MLA
“50 & 100 Years Ago.” Nature, vol. 443, no. 7112, Oct. 2006, p. 639. EBSCOhost, https://doi.org/10.1038/443639a.
APA
50 & 100 years ago. (2006). Nature, 443(7112), 639. https://doi.org/10.1038/443639a
Chicago
“50 & 100 Years Ago.” 2006. Nature 443 (7112): 639. doi:10.1038/443639a.