Singleton, R., & Straits, B. C. Approaches to social research (Fourth edition.).
芝加哥风格引文Singleton, Royce, 与 Bruce C. Straits. Approaches to Social Research. Fourth edition.
MLA引文Singleton, Royce, 与 Bruce C. Straits. Approaches to Social Research. Fourth edition.
警告：这些引文格式不一定是100％准确.