Centesimus annus
   Chap., §
 1 Int,  1(1)   |           Novarum (May 15, 1891): Leonis XIII P.M. Acta, XI, Romae
 2   1,  4(7)   |    Sapientiae (February 10,1880): Leonis XIII P.M. Acta, II, Romae
 3   1,  4(7)   |  Diuturnum Illud (June 29, 1881): Leonis XIII P.M. Acta, II, Romae
 4   1,  4(7)   | Praestantissimum (June 20, 1888): Leonis XIII P.M. Acta, VIII, Romae
 5   1,  4(7)   |       communi (January 18, 1901): Leonis XIII P.M. Acta, XXI, Romae
 6   2,  17(47) |   Sapientiae (February 10, 1880): Leonis XIII P.M. Acta, II, Romae
 7   2,  17(47) |           Illud (June 29, 1881 ): Leonis XIII P.M. Acta, II, Romae
 8   2,  17(47) |           Dei (November 1, 1885): Leonis XIII P.M. Acta, V, Romae
 9   2,  17(47) |   Christianae (January 10, 1890): Leonis XIII P.M. Acta, X, Romae
10   2,  17(47) |       Muneris (December 28,1878): Leonis XIII P.M. Acta, I, Romae
11   2,  17(47) | Praestantissimum (June 20, 1888): Leonis XIII P.M. Acta, VIII, Romae


Dominum et vivificantem
   Chap., §
12 Int,  2(5)   |         Munus (May 9, 1897): Acta Leonis, 17 (1898), pp. 125-148;


Ecclesia de Eucharistia
   Chap., §
13 Int,  9(5)   |                                   Leonis XIII P.M. Acta, XXII (1903),


Redemptoris Mater
   Chap., §
14   2,  29(74) |           5 September 1985): Acta Leonis XV, 300-312.~
15   3,  41(110)|          22 September 1891): Acta Leonis, XI, 299-315.~


Slavorum apostoli
   Chap., §
16   1,  1(2)   |            30 September 1880), in Leonis XIII Pont. Max. Acta, II,


Sollicitudo rei socialis
   Chap., §
17   1,  1(1)   |           Novarum (May 15, 1891): Leonis XIII P. M. Acta, XI, Romae
18   2,  8(19)  |         condition of the workers" Leonis XIII P. M. Acta, XI, Romae


Veritatis splendor
   Chap., §
19   2,  34(58) |  Praestantissimum (June 20,1888): Leonis XIII P.M. Acta, VIII, Romae
20   2,  44(83) |  Praestantissimum (June 20,1888): Leonis XIII P.M. Acta, VIII, Romae