Three-dimensiona model of crisis by R.A. Myer, R.C. Williams, A.J. Ottens, A.E. Schmidt / Trójwymiarowy model kryzysu R.A. Myer, R.C. Williams, A.J. Ottens, A.E. Schmidt
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<span class="int-own-work" lang="en">Own work</span>, based on PNG version created by <a href="//commons.wikimedia.org/wiki/User:Niki_K" title="User:Niki K">Niki K</a>