@inbook{+1949+50+71,
url = {https://doi.org/10.4159/harvard.9780674183322.c11},
title = {BEGINNING OF THE OPEN CONTRACT, 1875-1880},
booktitle = {The History of an Advertising Agency},
booktitle = {N. W. Ayer & Son at Work, 1869-1949},
publisher = {Harvard University Press},
address = {Cambridge, MA and London, England},
pages = {50--71},
doi = {doi:10.4159/harvard.9780674183322.c11},
isbn = {9780674183322},
year = {1949},
lastchecked = {2026-05-11}
}