I forget who asked this question (sorry) but here's all you'll ever need to know about all pedals, including sostenuto:
1. The art of piano pedaling : two classic guides<http://www.worldcatlibraries.org/oclc/53846893&referer=brief_results>
by Joseph Banowetz; Brian Richard Mann; Anton Rubinstein; Teresa Carreño
Language: English Type: Book
Publisher: Mineola, N.Y. : Dover Publications, ©2003.
2. The pianist's guide to pedaling<http://www.worldcatlibraries.org/oclc/10799298&referer=brief_results>
by Joseph Banowetz; Dean Elder
Language: English Type: Book
Publisher: Bloomington : Indiana University Press, ©1985.
3. Essays on artistic piano playing and other topics<http://www.worldcatlibraries.org/oclc/44962515&referer=brief_results>
by Silvio Scionti; Jack Guerry; NetLibrary, Inc.
Language: English Type: Internet Resource Computer File
Publisher: Denton, Tex. : University of North Texas Press, ©1998.
4. The art of pedaling; a manual for the use of the piano pedals.<http://www.worldcatlibraries.org/oclc/947024&referer=brief_results>
by Heinrich Gebhard
Language: English Type: Book
Publisher: [New York] F. Colombo [1963]
5. A history of pianoforte pedalling<http://www.worldcatlibraries.org/oclc/27010446&referer=brief_results>
by David Rowland, Dr.
Language: English Type: Book Internet Resource
Publisher: Cambridge [England] ; New York : Cambridge University Press, 1993.
6. A comparison of piano pedaling literature<http://www.worldcatlibraries.org/oclc/35094464&referer=brief_results>
by Miranda Wong
Language: English Type: Book : Thesis/dissertation/manuscript : Microform Archival Material
Publisher: 1994.
7. The pedals of the piano-forte and their relation to piano-forte playing and the teaching of composition and acoustics. Four lectures delivered at the Conservatory of music, in Vienna,<http://www.worldcatlibraries.org/oclc/563007&referer=brief_results>
by Hans Schmitt; Frederic S Law
Language: English Type: Book
Publisher: Philadelphia, T. Presser, ©1893.
8. The art of the pedal<http://www.worldcatlibraries.org/oclc/47146114&referer=brief_results>
by Nadezhda Iosifovna Golubovskai︠a︡; G A Orlov
Language: English Type: Book
Publisher: Washington, D.C. : H.A. Frager & Co., ©2000.
9. Modern technique of the pedal : a piano pedal study<http://www.worldcatlibraries.org/oclc/3299968&referer=brief_results>
by Karl Ulrich Schnabel
Jim Frazee
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