The chapter explains, 'If you are quoting a person who is quoting another person, use a single quotation mark like this: My teacher referred to APJ Abdul Kalam who said, 'I'm not a handsome guy...''
Class 6 › English Grammar and Composition › Chapter 8: Punctuation & Capitalisation › Topic: Exclamation Mark usage (commands, forceful speech, avoiding multiple marks and other punctuation)
Aligned to the NCTB national curriculum.