APA
(1991). Introduction to the physics/Chike-Obi B. Ibadan: H.E.B.
Chicago
1991. Introduction to the physics/Chike-Obi B. Ibadan: H.E.B.
Harvard
(1991). Introduction to the physics/Chike-Obi B. Ibadan: H.E.B.
MLA
Introduction to the physics/Chike-Obi B. Ibadan: H.E.B. 1991.