found: Her On trial, 1899.
found: OCLC, May 12, 1999(hdg.: Keats, Gwendoline; usages: Gwendoline Keats, Zack)
found: At the circulating library : a database of Victorian fiction, 1837-1901, 11 August 2020(Gwendoline Keats, 1865-1934; Zack; novelist)
found: Ancestry.com, 11 August 2020(Gwendoline Keats; Zack; born October 1865 in Northam, Devon, England; died June 1934 in Keynsham, Somerset, England)
found: Biographical dictionary and synopsis of books, 1902:volume 1, page 609 (Keats, Gwendline; "Zack"; English author)