Hich source would provide credible information about early efforts to stop elephant poaching? a recent news article in national geographic magazine a youtube video interview with a park ranger in kenya a book published in 1970 by a soldier trained to protect elephants an editorial article on nationalparkstraveler. com

> The National Geographic magazine is recent, so it probably wouldn't have the best information on early efforts to stop poaching.
> The YouTube video is from an unknown source and unknown time, so its credibility is questionable.
> An editorial is opinionated, so there aren't many concrete, reliable facts.

The book is likely the most credible source because it isn't recent and the author has direct experience with elephants and efforts to stop elephant poaching.