Each citation style has specific formatting requirements. 

APA

Student Paper Formatting Guidelines by RDP Library

Sample Student Paper by the official APA Style website

MLA

Student Paper Guidelines by RDP Library

Formatting a Research Paper by the official MLA Style Center

Sample Papers by the official MLA Style Center

Chicago

Manuscript Formatting (2.7-2.25) by the official Chicago Manual of Style Online (RDP login required)

Sample Paper by Purdue OWL