Underwood, G. (1967). A contribution to the classification of snakes. British Museum (Natural History).
芝加哥风格引文Underwood, Garth. A Contribution to the Classification of Snakes. London: British Museum (Natural History), 1967.
MLA引文Underwood, Garth. A Contribution to the Classification of Snakes. British Museum (Natural History), 1967.
警告：这些引文格式不一定是100％准确.