Mnnlaxer

"A common argument in a dispute about reliable sources is that one source is biased and so another source should be given preference. The bias in sources argument is one way to present a POV as neutral by excluding sources that dispute the POV as biased. Biased sources are not inherently disallowed based on bias alone, although other aspects of the source may make it invalid. Neutral point of view should be achieved by balancing the bias in sources based on the weight of the opinion in reliable sources and not by excluding sources that do not conform to the writer's point of view."

Identifying reliable sources - Biased or opinionated sources:

"Wikipedia articles are required to present a neutral point of view. However, reliable sources are not required to be neutral, unbiased, or objective. Sometimes non-neutral sources are the best possible sources for supporting information about the different viewpoints held on a subject. Common sources of bias include political, financial, religious, philosophical, or other beliefs. While a source may be biased, it may be reliable in the specific context."

Neutral point of view FAQ - Lack of neutrality as an excuse to delete:

"It is a frequent misunderstanding of the NPOV policy, often expressed by newbies, visitors, and outside critics, that articles must not contain any form of bias, hence their efforts to remove statements they perceive as biased. The NPOV policy does forbid the inclusion of editorial bias, but does not forbid properly sourced bias. Without the inclusion and documentation of bias in the real world, many of our articles would fail to document the sum total of human knowledge, and would be rather "blah" reading, devoid of much meaningful and interesting content."

Neutrality of sources:

"The reliable sources guideline refers to a source's overall reputation for fact-checking and reliability--not the source's neutrality. Reliable sources may be non-neutral: a source's reputation for fact-checking is not inherently dependent upon its point of view."

Other

Graham's Hierarchy of Disagreement. Try to stay in the top three sections of this hierarchy.
From Arguments to avoid in deletion discussions.

Lacrosse
WikiProject

Lead article	talk
Root category	talk
Main project page	talk
→ Goals
→ Tasks
→ Assessment	talk
→ Members
→ New articles

Organisation
Project banner
Project category

Studies
General topics
→ Tournaments	talk
→ Equipment	talk
Lacrosse leagues
→ National Lacrosse League	talk
→ Premier Lacrosse League	talk
→ Major League Lacrosse	talk
→ College lacrosse	talk
Lacrosse by country
→ Australia	talk
→ Canada	talk
→ Iroquois Confederacy	talk
→ United States	talk
→ Scotland	talk
→ Spain	talk
History of Lacrosse
→ Field lacrosse	talk
→ Box lacrosse	talk
→ Women's lacrosse	talk