1Article on Mar IV quartet, Acapella web site. "Allan started in Eugene, Oregon in 1958 at the age of 16. He was now the lead of a potential International champion."
1Texas Marriage Records, http://userdb.rootsweb.com/tx/. "Fjile #137232, Koberstein, Alan L., age 31, Dunken, Sharon S. age 23 married 06 DEC 1974 in Bexar County Texas."
1Texas Birth Records, http://userdb.rootsweb.com/tx/. "Paul Dunken Koberstein born on 06 DEC 1974 at Bexar county Texas."
1Texas Marriage Records, http://userdb.rootsweb.com/tx/. "File #176353, Paul D. Koberstein (age 18) married Kimberly M. Smith (age 18) on 25 SEP 1993 at Bexar county, Texas."