Twarog, Betty M. (1953). "Responses of a molluscan smooth muscle to acetylcholine and 5-hydroxytryptamine". Journal of Cellular and Comparative Physiology. 44 (1): 157–161. doi:10.1002/jcp.1030440112. PMID13211759.
Twarog, Betty M.; Page, Irvine (1953). "Serotonin content of some mammalian tissues and urine and a method for its determination". Am J Physiol. 175 (1): 157–161. doi:10.1152/ajplegacy.1953.175.1.157. PMID13114371.
Twarog, Betty M. (1953). "Responses of a molluscan smooth muscle to acetylcholine and 5-hydroxytryptamine". Journal of Cellular and Comparative Physiology. 44 (1): 157–161. doi:10.1002/jcp.1030440112. PMID13211759.
Twarog, Betty M.; Page, Irvine (1953). "Serotonin content of some mammalian tissues and urine and a method for its determination". Am J Physiol. 175 (1): 157–161. doi:10.1152/ajplegacy.1953.175.1.157. PMID13114371.