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"A quote by Bill Watterson" theysaidso.com, 2024. Apr 19, 2024. https://theysaidso.com/quote/bill-watterson-the-surest-sign-of-intelligent-life-in-the-universe-is-that-they
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"A quote by Bill Watterson" (n.d.). theysaidso.com. Retrieved Apr 19, 2024, from theysaidso.com web site : https://theysaidso.com/quote/bill-watterson-the-surest-sign-of-intelligent-life-in-the-universe-is-that-they
Chicago Style Citation
"A quote by Bill Watterson". theysaidso.com, 2024. https://theysaidso.com/quote/bill-watterson-the-surest-sign-of-intelligent-life-in-the-universe-is-that-they , accessed Apr 19, 2024.