Standard language, Heteronomous language, Natural language
Alphascript Publishing (23.09.2011) - ISBN-13: 978-613-7-09893-6
Language, Germanic languages, English language, International auxiliary language
Flu Press (02.10.2011) - ISBN-13: 978-613-7-22260-7
Extinct language, Gurage people, Semitic, Hadiyya language, Language survey
Acu Publishing (11.07.2012) - ISBN-13: 978-620-1-38236-7
International auxiliary language, Occidental language, Neo (constructed language)
Chromo Publishing (25.09.2011) - ISBN-13: 978-613-7-11521-3
Langues d'oïl, Standard language, French language
Brev Publishing (24.09.2011) - ISBN-13: 978-613-7-10655-6
Kiranti languages, Bantawa language, Puma language
Chromo Publishing (22.08.2011) - ISBN-13: 978-613-6-75934-0
Occitano-Romance languages, Occitan language, Catalan language
Equ Press (05.10.2011) - ISBN-13: 978-613-7-29002-6
Mixed language, West Iberian languages, Language shift
Aud Publishing (09.10.2011) - ISBN-13: 978-613-7-34428-6
AN ALIEN LANGUAGE OR AN INTERNATIONAL LANGUAGE?
VDM Verlag Dr. Müller (09.10.2008) - ISBN-13: 978-3-639-08202-9
Language, Constructed language, Formal language
Fidel (06.07.2012) - ISBN-13: 978-620-1-33880-7
Endangered language, Mixed language, Kallawaya people
Chrono Press (22.08.2011) - ISBN-13: 978-613-6-75915-9
Aramaic language, Syriac language, Siirt Province
Fec Publishing (22.06.2011) - ISBN-13: 978-613-6-75433-8
Moselle Franconian dialects, German language, French language, High German languages, National language, Napoleon
Fidel (02.10.2011) - ISBN-13: 978-613-7-23057-2
Programming language, Pascal (programming language), RTL/2
Civ (18.08.2011) - ISBN-13: 978-613-6-72427-0
First language, English language, Second language
Equ Press (24.09.2011) - ISBN-13: 978-613-7-11141-3
Language, Nuristani languages, Indo-European languages, Language family
Ceed Publishing (12.01.2013) - ISBN-13: 978-620-0-95333-9
Elfelejtette a jelszavát?