Laarman, Jan G.. International travel by U.S. conservation groups and professional societies / Jan G. Laarman, Timothy P. Stewart, Jeffrey P. Prestemon. - 1989. // Journal of travel research. Vol. 28 (1989/90), No. 1
Laarman, Jan g.. Pricing policy in nature-based tourism / Jan G. Laarman, Hans M. Gregersen. - 1996. // Tourism management : research - policies - practice. Vol. 17 (1996), No. 4
Laarman, Jan g.. Science tourism in Costa Rica / Jan G. Laarman, Richard R. Perdue. - 1989. // Annals of Tourism Research : a Social Sciences Journal. Vol. 16 (1989), No. 2
Laarman, Jan G.. Tropical science and tourism : the case of OTS in Costa Rica / Jan G. Laarman, Richard R. Perdue. - 1989. // Tourism management : research - policies - practice. Vol. 10 (1989), No. 1
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