Collins. (2011). CollinsEasy Learning Spanish Grammar. HarperCollins Publishers.
芝加哥风格引文Collins. CollinsEasy Learning Spanish Grammar. Great Britain: HarperCollins Publishers, 2011.
MLA引文Collins. CollinsEasy Learning Spanish Grammar. HarperCollins Publishers, 2011.
警告：这些引文格式不一定是100％准确.