"Encyclopedias and dictionaries." . . . . . . . . . . "Whose what? : Aaron's beard to Zorn's lemma" . "Whose what? Aaron?s beard to Zorn?s lemma"@en . . . "Whose what? Aaron's beard to Zorn's lemma" . . "Whose what?" . . "Terms and phrases" . "Explanations are offered for a number of expressions that have entered the American language." . .