@other{https://thesis.library.caltech.edu/id/eprint/8751,
    authors = "Carnahan, Stanley Crosson",
    title = "The Principles Involved in a Factory Cost System",
    year = "1918",
    url = "https://resolver.caltech.edu/CaltechTHESIS:01072015-113121430",
    id = "https://thesis.library.caltech.edu/id/eprint/8751",
    doi = "10.7907/WPHN-MQ53"
}