Philosophy does not have one specific citation style to rule them all - journals may have their own idiosyncratic styles or may use one of the standards, often Chicago (Author-Date), MLA, APA, or even American Sociological Association style. Here are links for information.
WSU Libraries Citation Style Quick Guides - "These quick reference guides are designed to provide easy access to common formatting and stylistic requirements for each citation style."
Purdue OWL - look under Research and Citation
APA
Free tutorial
Just in case, APA Sixth Edition Resources
Just in case, APA Sixth Edition Resources
ASA (Willamette University)