According to Podsakoff (2003) common-method variance (CMV) is the spurious "variance that is attributable to the measurement method rather than to the constructs the measures are assumed to represent or equivalently as "systematic error variance shared among variables measured with and introduced as a function of the same method and/or source.
Please find some papers which could help:
-Podsakoff, P.M.; MacKenzie, S.B.; Lee, J.-Y.; Podsakoff, N.P. (October 2003). "Common method biases in behavioral research: A critical review of the literature and recommended remedies" (PDF). Journal of Applied Psychology. 88 (5): 879–903. doi:10.1037/0021-9010.88.5.879. PMID 14516251.
-Richardson, H.A.; Simmering, M.J.; Sturman, M.C. (October 2009). "A tale of three perspectives: Examining post hoc statistical techniques for detection and correction of common method variance". Organizational Research Methods. 12 (4): 762–800. doi:10.1177/1094428109332834.