APA

Pearl R. M., Pearl R. M., . (1959). 1001 questions answered about the mineral kindgom. New York: Dodd, Mead.

Chicago

Pearl Richard Maxwell, Pearl Richard Maxwell, . 1959. 1001 questions answered about the mineral kindgom. New York: Dodd, Mead.

Harvard

Pearl R. M., Pearl R. M., . (1959). 1001 questions answered about the mineral kindgom. New York: Dodd, Mead.

MLA

Pearl Richard Maxwell, Pearl Richard Maxwell, . 1001 questions answered about the mineral kindgom. New York: Dodd, Mead. 1959.