Dicks, Terrance. Doctor Who and the underworld / [electronic resource] / Terrance Dicks.. — London : Secaucus, N.J. : : W.H. Allen ; : Distributed by Lyle Stuart Inc.,, c1980.. — 123 p. ; 18 cm. — (Doctor Who series).
"A Target book." "Based on the BBC television serial by Bob Baker and Dave Martin by arrangement with the British Broadcasting Corporation."