“According to child-experts—and every child is an expert on something—the function of a parent is to provide information, entertainment, transportation, and spot cash on demand.”
Forward to The Power of Negative Thinking (1955)
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“Clarke's Fourth Law: For every expert there is an equal and opposite expert.”
Profiles of the Future (1999, London: Victor Gollancz) p. 143
On Clarke's Laws
Arnold Tustin in: Rufus Oldenburger (1956) Frequency response. p. 139

Source: Father and Child Reunion (2001), p. 187.

"Ben Watson interviews Frank Zappa", in MOJO magazine (October 1993).
"An Interview With Qian Julie Wang" in Penguin Random House https://www.penguinrandomhouse.com/articles/qian-julie-wang-interview/

“If an expert says it can't be done, get another expert.”
As quoted in Words from the Wise : Over 6,000 of the Smartest Things Ever Said (2007) by Rosemarie Jarski, p. 170