au·thor·ship 
/ˈɑ:θɚˌʃɪp/ noun
/ˈɑ:θɚˌʃɪp/ noun [noncount] 1 : the identity of the person who has written something
▪ The novel is of unknown authorship. [=the author/writer of the novel is unknown] 2 : the job or profession of writing
▪ His first attempt at authorship failed.
▪ The novel is of unknown authorship. [=the author/writer of the novel is unknown]
▪ His first attempt at authorship failed.
