SABCA S.20 (3D)
neznámý (unknown)
Letectví, Vol. XVI. (1936), No. 3 (March), p. 106, <a rel="nofollow" class="external free" href="https://kramerius.army.cz/search/i.jsp?pid=uuid:bf2eaf5f-5eff-11e9-b588-005056b73ae5">https://kramerius.army.cz/search/i.jsp?pid=uuid:bf2eaf5f-5eff-11e9-b588-005056b73ae5</a>