w26.09 p. 21 par. 4

lff lesson 54 point 1

lff lesson 42 point 6

lff lesson 42 point 6

lff lesson 42 point 6

w18.12 p. 11 par. 8

ijwbq article 178 par. 3

w20.05 p. 4 par. 6

ijwbq article 146

mwb19.12 p. 3

ijwbq article 86

w22.04 pp. 5-6

w22.09 p. 14 par. 1

lff lesson 36

w18.07 pp. 23-26 pars. 7-17

w26.04 p. 11 par. 11

w18.07 pp. 24-25 pars. 10-12