[2009-08-07]. (原始内容存档于2015-09-24). Williams, David R. The "Moon Trees". Goddard Space Flight Center. NASA. 2009-07-28 [2009-08-07]. (原始内容存档于2021-03-18)
Charlotte Observer. 2 April 2008 [13 December 2018] –通过North Carolina HighSchool Track & Field and Cross-Country. Otto Soemarwoto, Lebih Banyak Memberi
Obamacare. The New Republic. 2013-08-13 [2020-06-27]. (原始内容存档于2021-01-22). Goddard, Teagan. Just Another Obamacare Delay. Roll Call. 2013-08-13 [2013-10-02]