Help my kind makeer iets, 1996: t.p. (Helena Bester)

SANB 97 (hdg.: Bester, Helena, 1958-; usage: Helena Bester)

SANB correspondence with author, July 8, 1997 (date of birth: January 26, 1958)

New hope for ADHD in children and adults, 2014: title page (Helena Bester) page 4 of cover (author on ADHD and learning problems. Offering neurotherapy as an additional therapy in her practice since 2005, she no longer works only with children)