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Lua i Stíl Chicago (17ú heag.)Institut geografii (Akademi︠i︡a nauk SSSR), ︠T︡Sentralʹnyĭ sovet po turizmu i ėkskursi︠i︡am (Soviet Union). Nauchno-tekhnicheskiĭ sovet, agus Boris Nikolaevich Likhanov. Geograficheskie Problemy Organiza︠t︡sii Turizma I Otdykha. Moskva: Turist, 1975.
Lua MLA (8ú heag.)Institut geografii (Akademi︠i︡a nauk SSSR), et al. Geograficheskie Problemy Organiza︠t︡sii Turizma I Otdykha. Turist, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.