Rhee, Seung Yon. "Gregor Mendel (1822-1884)". Access Excellence. Atlanta, GA: National Health Museum. मूल से 27 दिसंबर 2014 को पुरालेखित. अभिगमन तिथि 2015-01-07.
Boughner, Julia C.; Buchtová, Marcela; Fu, Katherine; एवं अन्य (June 25, 2007). "Embryonic development of Python sebae – I: Staging criteria and macroscopic skeletal morphogenesis of the head and limbs". Zoology. Amsterdam, the Netherlands: Elsevier. 110 (3): 212–230. PMID17499493. आइ॰एस॰एस॰एन॰0944-2006. डीओआइ:10.1016/j.zool.2007.01.005.
Boughner, Julia C.; Buchtová, Marcela; Fu, Katherine; एवं अन्य (June 25, 2007). "Embryonic development of Python sebae – I: Staging criteria and macroscopic skeletal morphogenesis of the head and limbs". Zoology. Amsterdam, the Netherlands: Elsevier. 110 (3): 212–230. PMID17499493. आइ॰एस॰एस॰एन॰0944-2006. डीओआइ:10.1016/j.zool.2007.01.005.
"A Modern Mass Extinction?". Evolution Library (Web resource). Evolution. Boston, MA: WGBH Educational Foundation; Clear Blue Sky Productions, Inc. 2001. OCLC48165595. मूल से 24 सितंबर 2015 को पुरालेखित. अभिगमन तिथि 2008-01-23.
Rhee, Seung Yon. "Gregor Mendel (1822-1884)". Access Excellence. Atlanta, GA: National Health Museum. मूल से 27 दिसंबर 2014 को पुरालेखित. अभिगमन तिथि 2015-01-07.
"A Modern Mass Extinction?". Evolution Library (Web resource). Evolution. Boston, MA: WGBH Educational Foundation; Clear Blue Sky Productions, Inc. 2001. OCLC48165595. मूल से 24 सितंबर 2015 को पुरालेखित. अभिगमन तिथि 2008-01-23.
Boughner, Julia C.; Buchtová, Marcela; Fu, Katherine; एवं अन्य (June 25, 2007). "Embryonic development of Python sebae – I: Staging criteria and macroscopic skeletal morphogenesis of the head and limbs". Zoology. Amsterdam, the Netherlands: Elsevier. 110 (3): 212–230. PMID17499493. आइ॰एस॰एस॰एन॰0944-2006. डीओआइ:10.1016/j.zool.2007.01.005.
"A Modern Mass Extinction?". Evolution Library (Web resource). Evolution. Boston, MA: WGBH Educational Foundation; Clear Blue Sky Productions, Inc. 2001. OCLC48165595. मूल से 24 सितंबर 2015 को पुरालेखित. अभिगमन तिथि 2008-01-23.