Wes Siegrist's new book - "Modern Masters of Miniature Art in America - refers to Louis Rosenthal multiple times and notes that: - "Louis Rosenthal is considered the father of miniature sculpture."
Wes Siegrist website: http://www.artofwildlife.com/miniature_painting_books.html

A link to the book can be found here:
http://www.artofwildlife.com/miniature_painting_books.html#A

This link provides specific pages from the book on Louis Rosenthal:
http://books.google.com/books?id=aRB6i3k3FpgC&pg=PA249&lpg=PA249&dq=wes+siegrist+book+louis+rosenthal&source=bl&ots=Ync6XivrsG&sig=mf4DQZk0i8OyDUECZ50cMDF1H2c&hl=en&ei=C7xATbGFFsfYgQfasunbAg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBYQ6AEwAA#v=onepage&q=louis%20rosenthal&f=false

National Museum of American Jewish History
http://www.nmajh.org/
http://www.nmajh.org/content.aspx?id=867

Art Knowledge News
www.artknowledgenews.com
http://www.artknowledgenews.com/2010-07-11-21-43-13-louis-rosenthal-online-museum-of-his-miniature-scuptures.html

The Jewish Museum of New York:
The Jewish Museum of New York Collection of Louis Rosenthal works

The Jewish Museum of Maryland Collection of Louis Rosenthal works:
http://jmm.pastperfect-online.com/00005cgi/mweb.exe?request=keyword;keyword=louis rosenthal;dtype=d

The Smithsonian Institution's reference to Louis Rosenthal:
http://collections.si.edu/search/results.jsp?q=louis+rosenthal&dsort=&view=&date.slider=&fq=name%3A%22Rosenthal%2C+Louis%22&start=0

http://siris-juleyphoto.si.edu/ipac20/ipac.jsp?uri=full=3100001~!119830!0#focus

The Corcoran Gallery of Art's 1923 exhibit of Louis Rosenthal's sculptures:
http://www.corcoran.org/exhibitions/archive_results.asp?Year=1923

Canadian Jewish Review:  July 27, 1928 / Multicultural Canada:
http://www.multiculturalcanada.ca/cdm_item/mcc_cjr/7871/100/20

Royal Society of Miniature Painters, Sculptors, and Gravers
http://www.royal-miniature-society.org.uk/index.htm

The Israel Museum, Jerusalem
http://www.english.imjnet.org.il/HTMLs/Home.aspx

The Miniature Painters, Sculptors & Gravers Society of Washington, D.C. (MPSGS)
http://www.mpsgs.org/index.htm

Art in Miniature - Contemporary Miniature Art
http://www.art-in-miniature.org/

The Washington County Museum of Fine Arts
http://www.wcmfa.org/

The Jewish Museum of New York
http://www.thejewishmuseum.org/index.php

Maryland Historical Society
http://www.mdhs.org/

The Walters Art Museum
http://thewalters.org/

The Baltimore Museum of Art
http://www.artbma.org/

The Jewish Museum of Maryland
http://www.jhsm.org/

The Charcoal Club of Baltimore
http://www.charcoalclubfineart.org/Artist.asp?ArtistID=20213&Akey=D3VYEH7W

The Ratner Museum
http://www.ratnermuseum.com/