Levine, M. (1924). Crown Gall on Bryophyllum calycinum. Zenodo.
Cita Chicago (17th ed.)Levine, Michael. Crown Gall on Bryophyllum Calycinum. Zenodo, 1924.
Cita MLA (9th ed.)Levine, Michael. Crown Gall on Bryophyllum Calycinum. Zenodo, 1924.
Atenció: Aquestes cites poden no estar 100% correctes.