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[[File:boston-sunday-post-Mar-06-1915-p-15a.jpg|thumbnail|left|250px|This article from the Boston Sunday Post shows how Twilight Sleep began to become popular in the United States.]]__NOTOC__

*Mark Sloan, ''[https://www.amazon.com/gp/product/0692220216/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0692220216&linkCode=as2&tag=dailyh0c-20&linkId=914784c1ec1e56c11ee8c2eda39d9ec5 Birth Day: A Pediatrician Explores the Science, the History, and the Wonder of Childbirth].''

*Paul Starr, ''[https://www.amazon.com/gp/product/0465093027/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0465093027&linkCode=as2&tag=dailyh0c-20&linkId=ae420b83fe47a08ce8d6de844dbeca6f The Social Transformation of American Medicine].''

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