Wiring Simplified: Based on the 2011 National Electrical Code by H. P. Richter - Richter - W. C. Schwan - F. P. Hartwell - F. P. - Frederic P. - F. P. Hartwell - H. P.; Schwan - H. P. / Schwan - W. Creighton / Hartwell - W. Creighton and Hartwell - ISBN 9780971977976