Per anno

@article{granovetter-ajs78,
    apice = {GranovetterAjs78},
    author = {Granovetter, Mark S.},
    journal = {American Journal of Sociology},
    month = may,
    number = 6,
    pages = {1360--1380},
    publisher = {The University of Chicago Press},
    title = {The Strength of Weak Ties},
    url = {https://www.jstor.org/stable/2776392},
    volume = 78,
    year = 1973
}