APA (7th ed.) Citation

Gibson, D. P. (1969). The 30 billion negro. MacMillan.

Chicago Style (17th ed.) Citation

Gibson, D. Parke. The 30 Billion Negro. Londres: MacMillan, 1969.

MLA (9th ed.) Citation

Gibson, D. Parke. The 30 Billion Negro. MacMillan, 1969.

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