Ayres, F. (1981). Schaums outline of theory and problems of differential equations in SI metric units. McGraw-Hill.

Ayres, Frank. Schaums Outline of Theory and Problems of Differential Equations in SI Metric Units. New Delhi: McGraw-Hill, 1981.

Ayres, Frank. Schaums Outline of Theory and Problems of Differential Equations in SI Metric Units. McGraw-Hill, 1981.