June 2015 Magazine – Production Saturday, Jun 6 2015 

Logic dictates that books with a paper (soft) cover, will not last as long as books with a hard cover.

February 2006, V5#2: Production Thursday, Jan 29 2009 

Among the various types of soft bindings, material placed in a three ring binder is considered softbound. Some might consider it hard binding however, due to it’s low durability, it is generally considered soft binding.