Maclay, T. Space Environmental, Legal, and Safety Issues. SPIE Digital Library.
Chicago-čujuhus (17. p.)Maclay, Timothy. Space Environmental, Legal, and Safety Issues. SPIE Digital Library.
MLA-čujuhus (9. p.)Maclay, Timothy. Space Environmental, Legal, and Safety Issues. SPIE Digital Library.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.