I have a large dataframe and I need to summarize based on 3 columns (source, source_detail, information) and values in column year will be put into list, like in Table 2.

My first code is

data %>% group_by(source, source_detail, information) %>% summarise(list_year = unique(year))

but it returns view like in Table 1 below,

while I need output like in Table 2 below

Is it possible to do that in R?