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Explanation: The literal translation should be fine.
s.a. = senza anno (no year/date of publication)
e.g.
London Duckworth n.d. but 1929 . First Edition. 24 b/w photo plates by Bruguiere. Open Book 72-73 . Bookplate and ownership signature same person ; foxing to the prelims ...
.. Catalogue of Books Illustrated by Arthur Rackham housed in the Rare Books and Special Collections, McLennan Library, McGill University". [Montreal: n.d. (but 1991)].
Explanation: date not given but presumed to be ...
It is the presumed date of this edition, not necessarily the first one.
Both these sources advise the use of square brackets.
see
Dispense - Come si scrive una tesi www.dssg.unifi.it/_PIM/EFSM/note-tesi.htm -
d) Luogo di edizione, casa editrice, anno. L’ordine di questi tre elementi indispensabili può variare, ma devono esserci tutti. Se non sono dichiarati, ricorrete alle forme [s. l.] = senza luogo di edizione, e [s. d.] = senza data di edizione. Ma si tratta di dichiarazioni di impotenza da ridurre al minimo. Se, pur non essendo dichiarati, li potete desumere, evidenziate l’integrazione con le solite parentesi: [s. d., ma 1880], o: [1880], o infine: [s. l. e s. d., ma Firenze, Albizziana, 1810].
and
http://www.aresearchguide.com/11guide.html
g) If there is no publication date, but you are able to find out from reliable sources the approximate date of publication, use [c. 2005] for circa 2005, or use [2005?]. Always use square brackets [ ] to indicate information that is not given but is supplied by you.
Shera Lyn Parpia Italy Local time: 19:54 Native speaker of: English PRO pts in category: 4
Explanation: The literal translation should be fine.
s.a. = senza anno (no year/date of publication)
e.g.
London Duckworth n.d. but 1929 . First Edition. 24 b/w photo plates by Bruguiere. Open Book 72-73 . Bookplate and ownership signature same person ; foxing to the prelims ...
.. Catalogue of Books Illustrated by Arthur Rackham housed in the Rare Books and Special Collections, McLennan Library, McGill University". [Montreal: n.d. (but 1991)].
The translation workplace 
