Tjitrahardja, Erick (2018) Analisis e-wom di akun instagram @Bersuaka beserta para followers-nya dalam mempopulerkan budaya dan minat membaca. Masters thesis, Universitas Pelita Harapan.

Tjitrahardja, Erick (2014) Peran sales promotion program-fitur plus friend kakao talk dalam mempopulerkan penggunaan aplikasi kakao talk = The role of plus friend feature as a sales promotion of kakao talk in order to make the use of kakao talk application become more popular. Bachelor thesis, Universitas Pelita Harapan.