Helen Tworkov (Tworkov, Helen)

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  Living Buddha Zen
  by Lex Hixon, Helen Tworkov
  Softcover, Larson Publications, ISBN 0943914752 (0-943914-75-2)
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  via
  Zen in America: Five Teachers and the Search for an American Buddhism
  by Helen Tworkov, Natalie Goldberg
  Softcover, Kodansha America, Incorporated, ISBN 1568360304 (1-56836-030-4)
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  Zen in America: Profiles of Five Teachers Robert Aitken, Jakusho Kwong, Bernard Glassman, Maurine Stuart, Richard Baker
  by Helen Tworkov
  Hardcover, North Point Press, ISBN 0865473544 (0-86547-354-4)