1 SEDLAN Koenig, Ljerka Sincerely yours : exercises in business correspondence / Ljerka Sedlan König. -3rd ed. - Osijek : Studio HS internet : Ekonomski fakultet, 2014. -(Knjižnica Ekonomskog fakulteta u Osijeku. Udžbenici ; 153) 811.111=111 SED S
2 On the Line : a practical training in telephoning skills SEDLAN-Koenig, Ljerka On the Line : a practical training in telephoning skills / Ljerka Koening Sedlan, Ljerka Radoš ; [ilustracije Miroslav Džoić]. - Osijek : Ekonomski fakultet, 2008. - 811.111 SED O
