name one source of data
The answer to your question is already available in our study material. Follow the given link and scroll down to the topic 'Sources of data' to view the same.
https://www.meritnation.com/cbse/class11-commerce/studymaterial/economics/statistics-for-economics/collection-of-data/443_2494_6417#slide1_meaning-and-sources-of-data
https://www.meritnation.com/cbse/class11-commerce/studymaterial/economics/statistics-for-economics/collection-of-data/443_2494_6417#slide1_meaning-and-sources-of-data