APA (7th ed.) Citation
Bigham, E. (2013). Introduction to PSPP: <a> step by step guide. [s.n.].
Chicago Style (17th ed.) Citation
Bigham, Elizabeth. Introduction to PSPP: <a> Step by Step Guide. [S.l.]: [s.n.], 2013.
MLA (9th ed.) Citation
Bigham, Elizabeth. Introduction to PSPP: <a> Step by Step Guide. [s.n.], 2013.
Warning: These citations may not always be 100% accurate.