Chemical Shifts:  "NMR Chemical shifts of common Laboratory Solvents as Trace Impurities", Hugo Gottlieb, Vadim Kotlyar, and Abraham Nudelman, Journal of Organic Chemistry, 1997, 62, 7512-7515.

NMR Chemical Shifts of Trace Impurities: Common Laboratory Solvents, Organics, and Gases in Deuterated Solvents Relevant to the Organometallic Chemist”, Gregory R. Fulmer, Alexander J.M. Miller, Nathaniel H. Sherden, Hugo E. Gottlieb, Abraham Nudelman, Brian M. Stoltz, John E. Bercaw, and Karen I. Goldberg, Organometallics, 2010, 29, 2176-2179.  DOI: 10.1021/om100106e.

Robert E. Taylor, "Setting up C-13 CP/MAS experiments" (2004).Concepts in Resonance Part A. 22A (1), pp. 37-49.

Robert E. Taylor, "C-13 CP/MAS: Application to glycine" (2004).Concepts in Magnetic Resonance Part A. 22A (2), pp. 79-89.

NMR Links
Study Problems for NMR Spectroscopy - UCLA Department of Chemistry and Biochemistry

University of Ottawa NMR Blog - Lots of useful NMR information here