Brooks 1982, pp. 53–54: Brooks wrote that she inadvertently told Avis Golden—an acquaintance of Marion Davies—about Pepi Lederer's sexual orientation during a telephone call shortly before Lederer was involuntarily committed to a psychiatric ward. Lederer was shocked by Brooks' breach of confidence and stated, "Everything you told Avis she will tell Marie Glendinning, who lives next door to her in Greenwich Village, and Marie will tell Marion." Soon after, Lederer was institutionalized at Good Samaritan Hospital. Brooks, Louise (1982). Lulu in Hollywood. New York City: Knopf. ISBN978-0-394-52071-1 – via Internet Archive.
Brooks 1982, p. 55: Monica Morris, Lederer's lesbian partner shortly before her death, told Brooks that "without warning, Marion and Mr. Hearst decided to have Pepi committed to the hospital for a drug cure." Brooks, Louise (1982). Lulu in Hollywood. New York City: Knopf. ISBN978-0-394-52071-1 – via Internet Archive.
Brooks 1982, p. 55: "In the hospital, she was left alone by the nurse for a moment in a room with steel-mesh screening over the window. In an agony of desolation, this powerful one-hundred-eighty-pound woman must have taken a running dive at the window in order to tear through the screen, and she hit the ground with force enough (according to the autopsy) to fracture her spine and almost every other bone in her body." Brooks, Louise (1982). Lulu in Hollywood. New York City: Knopf. ISBN978-0-394-52071-1 – via Internet Archive.
Brooks 1982, p. 34: "In contrast to their serious treatment of her brother Charlie Lederer, for whom they obtained a screenwriting job at the Metro-Goldwyn-Mayer studio, their treatment of Pepi was that accorded a naughty, entertaining child, incapable of any serious endeavor." Brooks, Louise (1982). Lulu in Hollywood. New York City: Knopf. ISBN978-0-394-52071-1 – via Internet Archive.
Brooks 1982, pp. 47–48: "Secretly, she had yearned to be a movie actress.... Pepi realized that no one had been really serious about her career—it was just a gag." Brooks, Louise (1982). Lulu in Hollywood. New York City: Knopf. ISBN978-0-394-52071-1 – via Internet Archive.
Brooks 1982, p. 48: "When Pepi hung up, she cried, 'Quick, Watson, the needle!' and dashed off to the apartment of the actress Alma Rubens, in the same building." Brooks, Louise (1982). Lulu in Hollywood. New York City: Knopf. ISBN978-0-394-52071-1 – via Internet Archive.
Brooks 1982, p. 48: "Pepi was much sobered when, after an hour, she returned from Alma's apartment. She had to wait till one of Marion's doctors came to give Alma an injection of morphine. Pepi had found her pacing up and down like a madwoman. All her money had gone to the drug-sellers". Brooks, Louise (1982). Lulu in Hollywood. New York City: Knopf. ISBN978-0-394-52071-1 – via Internet Archive.
Brooks 1982, p. 51: "At the end of March, I stopped by the Warwick to see Pepi and found her in bed, sick, feverish, and frightened. She had had an abortion and was hemorrhaging badly." Brooks, Louise (1982). Lulu in Hollywood. New York City: Knopf. ISBN978-0-394-52071-1 – via Internet Archive.
San Francisco Examiner 1935, p. 7: "Miss Lederer, who had entered the hospital on Monday to recover from a nervous breakdown caused by overstudy, fell from the window when, weak from illness, she attempted to walk alone... A brilliant student, she had continued her studies since graduating from the Westlake School for Girls in 1926, and her recently completed an intensive period of education abroad.... This overstudy led to the collapse which caused her to enter the hospital Monday." "Pepi Lederer Funeral Will Be Held Today". The San Francisco Examiner (Thursday ed.). San Francisco, California. June 13, 1935. p. 7. Retrieved May 1, 2022 – via Newspapers.com.
San Francisco Examiner 1935, p. 7: In later obituaries published by Hearst's newspaper chain, Marion Pope's statement was later altered to imply Lederer's death was an accident as opposed to a suicide: "Suddenly I heard a noise behind me and turned in time to see Miss Lederer falling from the window, the weight of her body having pried the screen from its fastenings." "Pepi Lederer Funeral Will Be Held Today". The San Francisco Examiner (Thursday ed.). San Francisco, California. June 13, 1935. p. 7. Retrieved May 1, 2022 – via Newspapers.com.