cant solve this joke.. who wrote the book “split personalities”?

please assist me i cant determine it out

It’s written by two folks (as in break up personalities) by the names Loyalty and Belief (?)

I am unsure if this can be a joke, however Christina Leigh Pritchard wrote a guide known as “break up persona”
and one other one by the identical identify was written by Alan A. Stone

Jacqueline
Hyde

mind me and unwell provide the reply. nah nah im kidding lol i dont know actully unwell put it on my watch checklist