@book{https://resolver.caltech.edu/CaltechAUTHORS:20170518-162941725,
    title = "Ehrlich's Geomicrobiology, 6th Edition",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20170518-162941725",
    id = "record",
    isbn = "9781466592407",
    doi = "10.1201/b19121"
}


@book{https://resolver.caltech.edu/CaltechAUTHORS:20170522-092432123,
    title = "Geomicrobiology, Fifth Edition",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20170522-092432123",
    id = "record",
    isbn = "9780849379062",
    doi = "10.1201/9780849379079"
}