Haberkorn, F. (2008). Ricarda Roggan: Creatures of the 20th century. Prestel.
Chicago-Zitierstil (17. Ausg.)Haberkorn, Falk. Ricarda Roggan: Creatures of the 20th Century. Munich [u.a.]: Prestel, 2008.
MLA-Zitierstil (8. Ausg.)Haberkorn, Falk. Ricarda Roggan: Creatures of the 20th Century. Prestel, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.