- [S6] Ancestry.com, U.S. Public Records Index, Volume 1, (Name: Name: Name: Name: Name: Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date:2010;;;;;;).
- [S276] Obituaries, Robertson Landgraf Obituary.
https://hawaiiobituaries.com/us/obituaries/hawaiiobituaries/name/robertson-landgraf-obituary?id=54406306
- [S1634] Newspapers.com - Honolulu Star-Bulletin - 18 Sep 1953 - Page 13, (Name: Name: Honolulu Star-Bulletin; Location: Honolulu, Honolulu, Hawaii, United States of America; Date: 18 Sep 1953;;), Marriage Libert Landgraf-Harriet Matilda Niaulani Robertson 1953 18 Sep 1953.
https://www.newspapers.com/clip/28105537/marriage_libert_landgrafharriet/?xid=637
- [S9014] Ancestry.com, Heiratsindex von Newspapers.com, 1800s - 2020, (Name: Ancestry.com Operations Inc; Location: Lehi, UT, USA; Date: 2020;), Honolulu Star-Bulletin; Publication Date: 18/ Sep/ 1953; Publication Place: Honolulu, Hawaii, USA; URL: https://www.newspapers.com/image/280433821/?article=68516824-b703-42f1-b8c5-4f50cbbcffb3&focus=0.021757081,0.25118402,0.15141714,0.5307444&xid=3398.
Record for Libert K. Landgraf
https://search.ancestry.com/cgi-bin/sse.dll?db=62116&h=98777667&indiv=try
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