NCERT. (2007). SOCIAL SCIENCE OUR ENVIRONMENT TEXTBOOK IN GEOGRAPHY FOR CLASS - VII. NCERT.
芝加哥风格引文NCERT. SOCIAL SCIENCE OUR ENVIRONMENT TEXTBOOK IN GEOGRAPHY FOR CLASS - VII. NEW DELHI: NCERT, 2007.
MLA引文NCERT. SOCIAL SCIENCE OUR ENVIRONMENT TEXTBOOK IN GEOGRAPHY FOR CLASS - VII. NCERT, 2007.
警告：这些引文格式不一定是100％准确.