O'Neill, P. (2010). A theoretical explanation of defective verbs in the Spanish language.
芝加哥风格引文O'Neill, P. A Theoretical Explanation of Defective Verbs in the Spanish Language. 2010.
MLA引文O'Neill, P. A Theoretical Explanation of Defective Verbs in the Spanish Language. 2010.
警告：这些引文格式不一定是100％准确.