Headway : student's book / John Soars, Liz Soars . Oxford :  Oxford Univ. Press , 1994 . 143 s . ISBN 0-19-433987-4 . [3, of that borrowed 0]

Thermal injury / Donald P. Dressler, Joseph L. Hozid, Paul Nathan . St. Louis :  The C.V. Mosby Co. , 1988 . 251 s . ISBN 0-8016-2456-8 . [1, of that borrowed 0]