@book{https://resolver.caltech.edu/CaltechBOOK:1985.001,
    title = "Calculus I",
    year = "1985",
    url = "https://resolver.caltech.edu/CaltechBOOK:1985.001",
    id = "record",
    isbn = "0387909745"
}


@book{https://resolver.caltech.edu/CaltechBOOK:1985.003,
    title = "Calculus II",
    year = "1985",
    url = "https://resolver.caltech.edu/CaltechBOOK:1985.003",
    id = "record",
    isbn = "0387909753"
}


@book{https://resolver.caltech.edu/CaltechBOOK:1985.005,
    title = "Calculus III",
    year = "1985",
    url = "https://resolver.caltech.edu/CaltechBOOK:1985.005",
    id = "record",
    isbn = "9780387909851"
}


@book{https://resolver.caltech.edu/CaltechBOOK:1981.001,
    title = "Calculus Unlimited",
    year = "1981",
    url = "https://resolver.caltech.edu/CaltechBOOK:1981.001",
    id = "record",
    isbn = "0-8053-6932-5"
}