Zimmerer, T. W., Scarborough, N. M., Wilson, D.
, Kwary, D. A., (TRANS.) & Fitriasari, D., (TRANS.) (2008).
Essentials of Entrepreneurship and Small Business Management. (5 ed.) PT Salemba Empat.
Tarp, S. (2013).
Lexicographic functions. In R. H. Gouws, U. Heid, W. Schweickard & H. E. Wiegand (Eds.),
Dictionaries. An International Encyclopedia of Lexicography: Supplementary volume: Recent Developments with Special Focus on Computational Lexicography (Vol. 5.4, pp. 460-468). De Gruyter.