APA引文

Obama, B., & Ruth, G. (2009). Our enduring spirit: President Barack Obama's first words to America. Harper.

Chicago Style (17th ed.) Citation

Obama, Barack, and Greg Ruth. Our Enduring Spirit: President Barack Obama's First Words to America. New York, NY: Harper, 2009.

MLA引文

Obama, Barack, and Greg Ruth. Our Enduring Spirit: President Barack Obama's First Words to America. Harper, 2009.

警告：這些引文格式不一定是100％准確.