Understanding Jewish Holidays and Customs: Historical and Contemporary - Sol Scharfstein - Google Books

http://books.google.de/books?id=mE031Ysq03wC&pg=PA21&dq=oneg+shabbat&lr=&as_brr=3&cd=18#v=onepage&q=oneg%20shabbat&f=false

A historical and contemporary overview of customs and ceremonies as practiced by Jews from Biblical times to the present, discussing the changes that have taken place through the centuries.