Which research method did Clifford Shaw (1930) use when detailing a delinquent boy's own life experiences in his book, The Jack Roller?

Question

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Clifford Shaw used ethnography in his study detailed in "The Jack Roller," focusing on the personal life experiences of a delinquent boy through direct observations and personal narratives, which is characteristic of ethnographic research.

Which Research Method Did Clifford Shaw (1930) Use When Detailing