APA (7th ed.) Citation

Esto, R. (1990). Book of riddles for students & professionals. R.E. Books Marketing.

Chicago Style (17th ed.) Citation

Esto, Rey. Book of Riddles for Students & Professionals. [S.l.]: R.E. Books Marketing, 1990.

MLA (9th ed.) Citation

Esto, Rey. Book of Riddles for Students & Professionals. R.E. Books Marketing, 1990.