Hubbard L.R. The management series. Vol. 1 : data series.The organizing series.The personnel series, 1991. - 518 p. - Текст : непосредственный.
Hubbard L.R. The management series. Vol. 2 : establishment officer series.The executive series.The finance series.The target series.The computer series, 1991. - 510 p. - Текст : непосредственный.
Hubbard L.R. The management series. Vol. 3 : public relations series.The marketing series.The Admin Know-how series, 1991. - 520 p. - Текст : непосредственный.