United States. Women's Bureau
and Best, Ethel L. (Ethel Lombard).
A Study of a Change From One Shift of 9 Hours to Two Shifts of 6 Hours Each : Women's Bureau Bulletin, No. 116 ,
Washington:
Govt. Print. Off.,
1934, https://fraser.stlouisfed.org/title/5414,
accessed on May 3, 2025.
@FedFRASER