Jóhannes Efnislykill að ritum Votta Jehóva – 2019 21:15 Vitnum ítarlega, bls. 30 Varðturninn (námsútgáfa),12.2017, bls. 135.2017, bls. 22-23, 26 Varðturninn,1.4.2010, bls. 25-2615.4.2008, bls. 321.6.2007, bls. 171.8.1992, bls. 16 Mesta mikilmenni, kafli 130
21:15 Vitnum ítarlega, bls. 30 Varðturninn (námsútgáfa),12.2017, bls. 135.2017, bls. 22-23, 26 Varðturninn,1.4.2010, bls. 25-2615.4.2008, bls. 321.6.2007, bls. 171.8.1992, bls. 16 Mesta mikilmenni, kafli 130