I think I sent the wrong wording regarding the books in the outline. The client only put them as 'suggested texts' rather than as texts that must be included in the writing. His exact comments on required sources were "None - the writer may use whatever sources he or she feels are most appropriate"
Therefore, if you would still like to the jobs then they are here for you to accept. Also, I can give you a week to write the both of them.
Sorry for any confusion.
Look forward to hearing from you.