The Teaching of Welsh as a second language to adults /
Welsh Office = Dysgu'r Gymraeg fel ail laith i oedolion / Y Swyddfa Gymreig.

APA Citation

Great Britain. Welsh Office. (1984). The Teaching of Welsh as a second language to adults. [Wales?]: H.M.S.O..

MLA Citation

Great Britain. Welsh Office. The Teaching of Welsh As a Second Language to Adults. [Wales?]: H.M.S.O., 1984.

Warning: These citations may not always be complete (especially for serials).