Tác giả: VLOS (Vietnamese Library of Science)
Nguồn tin: http://tusach.thuvienkhoahoc.com/wiki/X%C3%A2y_d%E1%BB%B1ng_c%C3%A2u_h%E1%BB%8Fi,_b%C3%A0i_t%E1%BA%ADp_theo_%C4%91%E1%BB%8Bnh_h%C6%B0%E1%BB%9Bng_ph%C3%A1t_tri%E1%BB%83n_n%C4%83ng_l%E1%BB%B1c_h%E1%BB%8Dc_sinh