Padron:DSB
"DSB". Dictionary of Scientific Biography. New York: Charles Scribner's Sons. 1970–80. ISBN 978-0-684-10114-9. {{cite ensiklopedya}}: Cite has empty unknown parameter: |coauthors= (tulong); Invalid |ref=harv (tulong)
"DSB". Dictionary of Scientific Biography. New York: Charles Scribner's Sons. 1970–80. ISBN 978-0-684-10114-9. {{cite ensiklopedya}}: Cite has empty unknown parameter: |coauthors= (tulong); Invalid |ref=harv (tulong)