I INTRODUCTION Philosophy, Western (Greek philosophia,"love of wisdom"), the rational and critical inquiry into basic principles. Philosophy is often ...
Dave Mearns has drawn on the lived experiences of both trainers and trainees to demonstrate the potential range and importance of training in this field. The material covered includes selecting and supporting trainers, selecting course members, skills development, supervision and other professional issues - essential features of all counsellor training, but of particular relevance to the person-centred approach. Written expressly for both trainees and trainers, this book also extends and develops current thinking within the approach, and will be a valuable resource for all person-centred practitioners.
Relative clauses can also interrupt a main clause. When this happens, use no punctuation for an essential clause. But if the clause is nonessential, separate it with a comma in front and a comma behind. Take a look at these examples:
The American frontier was generally the westernmost edge of a settlement and typically more free-spirited than in the East because of its lack of social and political institutions. The idea that the frontier provided the core defining quality of the United States was elaborated by the historian Frederick Jackson Turner , who built his Frontier Thesis in 1893 around this notion. Subsequently, the frontier has also been described as the point of contact between two cultures, where contact led to exchanges that affected both cultures. 
The airline industry is responsible for the transportation of people, goods and post around the globe (cp. Netzer 1999, p. 18). It is affected by many factors, including war, economic business cycle, and business competition (cp. Wang 2004, p. 455) as well as its traditionally high level of regulation (cp. Vaara/Kleymann/Seristoe 2004, p. 11). It has been characterised as being an extremely competitive, safety-sensitive, service industry  (cp. Appelbaum/Fewster 2002, p. 66). These three characteristics of the industry have a large impact on HRM, as will be explained in subsequent paragraphs.