GULAK, Ks. Stanisław. Friendship – the value of personal relationships in different periods of human of the life of human beings. Nursing in the 21st Century, Lublin, Poland, v. 11, n. 1(38), p. 73–77, 2012. Disponível em: https://czasopisma.umlub.pl/piel21w/article/view/2713. Acesso em: 8 jun. 2025.