"There are close to ten million known carbon compounds, many thousands of which are vital to organic and life processes." Chemistry Operations (December 15, 2003). "Carbon". Los Alamos National Laboratory. Diarsipkan dari versi asli tanggal 2008-09-13. Diakses tanggal 2008-10-09.
"There are close to ten million known carbon compounds, many thousands of which are vital to organic and life processes." Chemistry Operations (December 15, 2003). "Carbon". Los Alamos National Laboratory. Diarsipkan dari versi asli tanggal 2008-09-13. Diakses tanggal 2008-10-09.