Angular distributions for the single-nucleon transfer reactions /sup 40/Ca(/sup 11/B,/sup 12/C)/sup 39/K(J/sup ..pi../=3/2/sup +/ and 1/2/sup +/) and /sup 40/Ca(/sup 11/B,/sup 10/B(J/sup ..pi../=3/sup +/ and 1/sup +/))/sup 41/Ca have been measured at 51.5 MeV. The distorted-wave Born approximation was used to analyze the data. The distorted waves used in the distorted-wave Born-approximation calculations were generated from both Woods-Saxon and double-folding optical potentials which describe elastic scattering data. The standard distorted-wave Born-approximation calculations reproduced the forward angle data, including the l=1 pickup reaction, but overpredicted the back-angle data. Distorted-wave Born-approximation calculations carried out with distorted waves obtained from double-folded potentials were in much better agreement with the data. The extracted spectroscopic factors for the proton pickup reaction are much larger than those obtained from light-ion data while for the neutron stripping case they agree, even for the case where /sup 10/B was in its first excited state.