Girl, Interrupted (1994)
“All men are liars, said Roberta Muldoon, who knew this was true because she had once been a man.”
Source: The World According to Garp
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John Irving 97
American novelist and screenwriter 1942Related quotes

"The Stranger Song" (1966)
Songs of Leonard Cohen (1967)

Part Three “The Exiles”, Chapter ii “Walking in the Dark” (p. 123)
(1987), BOOK ONE: IN THE KINGDOM OF THE CUCKOO

As quoted in The Histories by Herodotus, 3.72
The validity of the quote is questionable. http://www.shsu.edu/~his_ncp/Heropers.html
Attributed

First published in The Southern Review (Spring 1939)
Source: The Company She Keeps (1942), Ch. 1 "Cruel and Barbarous Treatment", p. 5, first lines of novel.
“All men are liars. All women are liars, too.”
Source: Burn for Me

“A man who lies to himself is the worst liar of all.”
Source: The Gate of Worlds (1967), Chapter 9 “To the Western Sea” (p. 162)