@other{https://resolver.caltech.edu/CaltechTHESIS:01072015-113121430,
    title = "The Principles Involved in a Factory Cost System",
    url = "https://resolver.caltech.edu/CaltechTHESIS:01072015-113121430",
    id = "record",
    doi = "10.7907/WPHN-MQ53"
}