Angular distributions for the 12C(p, d) 11C reaction to the ground state and three excited states of 11C at a proton energy of 155 MeV have been analysed using a conventional DWBA model. Finite-range effects are treated using the local-energy approximation and a large correction to the zero-range approximation is found for the optical potentials used. The angular distributions are relatively insensitive to the parameters of the neutron wave function. Experimental spectroscopic factors are in reasonable agreement with the theoretical predictions of intermediate coupling calculations. Possible mechanisms for transitions to "forbidden" states are considered.