Walzer Leavitt & Numbers 1997, p. 560. Walzer Leavitt, Judith; Numbers, Ronald L., eds. (1997). "Typhoid Mary Strikes Back". Sickness and Health in America: Readings in the History of Medicine and Public Health. Vol. 3. Wisconsin: The University of Wisconsin Press. ISBN0299153207.
Walzer Leavitt & Numbers 1997, p. 561. Walzer Leavitt, Judith; Numbers, Ronald L., eds. (1997). "Typhoid Mary Strikes Back". Sickness and Health in America: Readings in the History of Medicine and Public Health. Vol. 3. Wisconsin: The University of Wisconsin Press. ISBN0299153207.
Walzer Leavitt & Numbers 1997, p. 559. Walzer Leavitt, Judith; Numbers, Ronald L., eds. (1997). "Typhoid Mary Strikes Back". Sickness and Health in America: Readings in the History of Medicine and Public Health. Vol. 3. Wisconsin: The University of Wisconsin Press. ISBN0299153207.
"Food Science Curriculum"(PDF). Illinois State Board of Education. p. 118. Archived from the original(PDF) on December 18, 2010. Retrieved February 9, 2011.
"Food Science Curriculum"(PDF). Illinois State Board of Education. p. 118. Archived from the original(PDF) on December 18, 2010. Retrieved February 9, 2011.