APA
(2018). Science encyclopedia: force, electricity, metals and non-metals. new delhi: om books international.
Chicago
2018. Science encyclopedia: force, electricity, metals and non-metals. new delhi: om books international.
Harvard
(2018). Science encyclopedia: force, electricity, metals and non-metals. new delhi: om books international.
MLA
Science encyclopedia: force, electricity, metals and non-metals. new delhi: om books international. 2018.
