Praga BH-39 (prototyp) s motorem Walter NZ-120 (1933)
neznámý (unknown)
Letetctví, Vol. 13. (1933), No. 9 (September), p. 253-254 - <a rel="nofollow" class="external free" href="https://kramerius.army.cz/search/i.jsp?pid=uuid:cb361288-5215-11e9-83bb-005056b73ae5">https://kramerius.army.cz/search/i.jsp?pid=uuid:cb361288-5215-11e9-83bb-005056b73ae5</a>