Dr Yap has written and published two books.
1. Strategic Market Plan: A Manual for Consumer Products and Services, Incorporating Social Media Platform: published in 2015.
2. How to Become a Successful Entrepreneur with an Initial RM50 Capital: published in 2016.
He is editing his doctoral dissertation. The tentative title: Training of Adult Learners in Malaysia: An Analysis of the Delivery System and Its Relevance. It is expected to be published in 2018.