In depth:

Booklist Reincarnation

Handboek Reïncarnatietherapie (not translated as far as I know, but very interesting!)
Drs. R. van der Maesen en drs. R. Bontenbal, De Tijdstroom, 2002

Many Lifetimes
Joan Grant en Denys Kelsey, 1973

Reliving Past Lives
Research done by dr. Helen Wambach, 1978, University of California

Other Lives, Other Selves
Roger J. Woolger

Terug naar vorige levens
Das Erlebnis der Widergeburt
Thorwald Dethlefsen

Ring van Licht, Reïncarnatie: denkbeelden en ervaringen
Almost certainly translated: a classic work!
Hans ten Dam

Beyond the Ashes, Cases of Reincarnation from the Holocaust
Rabbi Yonassan Gershom

From Ashes to Healing - Mystical Encounters with the Holocaust
Rabbi Yonassan Gershom

Discovering your Past Lives
Glenn Williston & Judith Johnstone