Koegel, Rudolph Be Thou Faithful Unto Death: Confirmation Sermons and Addresses by Lutheran Pastors in Germany and America

Koegel, Robert L. Pivotal Response Treatments for Autism: Communication, Social, and Academic Development

Koegel, Rudolf Der abenteuerliche Simplicissimus, Abdruck der ältesten Originalausgabe 1869

Koegel, Lynn Kern Hidden Brilliance: Unlocking the Intelligence of Autism