Northrop_XP 56 Black_Bullet_XP 56 Black_Bullet là một mẫu thử máy_bay_tiêm_kích đánh chặn do hãng Northrop chế_tạo Tham_khảo BULLET Ghi_chú BULLET Tài_liệu BULLET Allen_R_S_The Northrop_Story_New_York Orion 1990 ISBN 0 517 56677 X BULLET Andersen_Fred_Northrop_An Aeronautical_History_A_Commemorative Book_Edition of Airplane_Designs and Concepts_Century_City_California Northrop_Corporation 1976 Library of Congress nr 76 22294 BULLET Balzer_Gerald_H_American Secret_Pusher_Fighters of World_War_II_XP 54 XP 55 and XP 56 North_Branch_Minnesota_Specialty Press 2008 ISBN 1 58007 125 2 BULLET Green_William_War_Planes of the Second_World_War_Volume Four_Fighters_London_MacDonald Co_Publishers_Ltd 1961 Sixth impression 1969 ISBN 0 356 01448 7 BULLET Green_William and Gordon_Swanborough WW2 Aircraft_Fact_Files_US Army_Air_Force_Fighters Part 2 London_Macdonald and Jane s Publishers_Ltd 1978 ISBN 0 354 01072 7 BULLET Jenkins_Dennis and Tony_Landis_Experimental and Prototype_U_S_Air Force_Jet_Fighters_North Branch_Minnesota_Specialty_Press 2008 ISBN 978 1 58007 111 6 BULLET Maloney_Edward_T_Northrop Flying_Wings_Buena_Park California_Planes_Of_Fame Publishers 1975 ISBN 0 915464 00 4 BULLET Pape_Gerry_John_M and Donna_Campbell_The_Flying Wings of Jack_Northrop_Atglen_Pennsylvania Schiffer 1994 ISBN 0 88740 597 5 BULLET Woolridge_E_T_Winged Wonders_The_Story of the Flying_Wings_Washington_D C Smithsonian_Press 1983 ISBN 0 87474 966 2
Northrop XP-56 Black_Bullet