-
1सरकारी दस्तावेज पुस्तकद्वारा Hurley, Edward J.“…United States. Office of Space Science and Applications…”
प्रकाशित 1983
-
2पुस्तकप्रकाशित 1968“…United States. Office of Space Science and Applications…”
-
3पुस्तकप्रकाशित 1970“…United States. Office of Space Science and Applications…”
-
4सम्मेलन की कार्यवाही पुस्तकप्रकाशित 1989“…United States. Office of Space Science and Applications…”