Ball, O. M. (1931). A contribution to the paleobotany of the Eocene of Texas. Agricultural and Mechanical College of Texas.
Citazione stile Chigago Style (17a edizione)Ball, Oscar Melville. A Contribution to the Paleobotany of the Eocene of Texas. College Station: Agricultural and Mechanical College of Texas, 1931.
Citatione MLA (8a ed.)Ball, Oscar Melville. A Contribution to the Paleobotany of the Eocene of Texas. Agricultural and Mechanical College of Texas, 1931.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.