Clinton Nwaneri Chinonso

Depends on scope and focus of the research, researcher write both title and sub titile.

• This is the main title of the work and is transcribed exactly as it appears on the title page. It reflects the primary subject or focus of the work. The subtitle follows the title proper and is separated by a colon. It provides additional information about the title proper, often clarifying or expanding on the main title's scope or focus.
• example Title: Subtitle. (The Future of Education: Innovations in Learning Technologies.)
• title and subtitle are separated by a colon (:)
• I hope you got answer.

@Ravish PY. Thanks for the clarification