Ancestry of Richard Plantagenet & Cecily de Neville @ Chart 1839, p 399, Isaac (Ammon in Greece, Nebkhepeshre Apop in Egypt)
The cited information was published by published by author, 1978 (Ref: Chart 1839, p 399, Isaac (Ammon in Greece, Nebkhepeshre Apop in Egypt)) The author/originator was Ernst-Friedrich Kraentzler.