1. Ravin CE. Disease signs in chest radiography. Optimization of Chest Radiography. U.S. Department of Health and Human Services Publication (FDA) 80–8124, pp. 3–7, 1980.
2. Kattan KR, Wiot JF. How was this chest roentgenogram taken, AP or PA? Am J Roentgenol 117: 843–845, 1973.
3. Hoffman RB, Rigler LG. Evaluation of left ventricular enlargement in the lateral projection of the chest. Radiology 85: 93–100, 1965.
4. Heitzman ER, Markarian B, Solomon J. Chronic obstructive pulmonary disease: A review, emphasizing roentgen pathologic correlations. Rad Clin of North Am 11: 49 - 75, 1973.
5. Gamsu G, Nadel JA. The roentgenologic manifestations of emphysema and chronic bronchitis. Med Clin North Am 57: 719–733, 1973.