Returns book sources/origins for the requested Brand
Input
transtype - "GETBOOKSOURCES"
login - API user's username
password - API user's password
brandid - The Brand to find the book sources of
campaignid - A specific campaign ID to pull the sources for (please speak with specific client to get a campaign they want to use)
...
Output
records - array of book sources
promo - The book source/origin ID. this is a GUID that is used in the BOOK call
description - The Description/Text for display to clients
segmented - The Segment ID of the book source
displayorder - The order in which to display the advertisements